Chemistry of the elements : Greenwood, N. N. (Norman Neill) : Free Download, Borrow, and Streaming : Internet Archive

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.open.media-menu .overflow-clip.media-menu { height: 40rem; } } @media (min-width: 890px) { .media-menu-1 .media-menu-inner.media-menu { display: block; position: static; width: auto; height: 5rem; transition-property: none; } .media-menu-1 .menu-group.media-menu { font-size: 0; } }</style><style scope="primary-nav-1">.primary-nav-1 button.primary-nav:focus,.primary-nav-1 input.primary-nav:focus { outline: none; } .primary-nav-1 nav.primary-nav { position: relative; display: flex; height: 4rem; grid-template-areas: 'hamburger empty heart search user'; -ms-grid-columns: 4rem minmax(1rem, 100%) 4rem 4rem 4rem; grid-template-columns: 4rem auto 4rem 4rem 4rem; -ms-grid-rows: 100%; grid-template-rows: 100%; background: #222; border-bottom: 1px solid #333; } .primary-nav-1 nav.hide-search.primary-nav { grid-template-areas: 'hamburger empty heart user'; -ms-grid-columns: 4rem minmax(1rem, 100%) 4rem 4rem; grid-template-columns: 4rem auto 4rem 4rem; } .primary-nav-1 .right-side-section.primary-nav { display: flex; margin-left: auto; user-select: none; } .primary-nav-1 button.primary-nav { background: none; color: inherit; border: none; font: inherit; cursor: pointer; } .primary-nav-1 .branding.primary-nav { position: static; float: left; margin: 0 !important; padding: 0 5px 0 10px; -webkit-transform: translate(0, 0); -ms-transform: translate(0, 0); transform: translate(0, 0); } .primary-nav-1 slot.primary-nav,.primary-nav-1 .branding.primary-nav { display: flex; justify-content: left; align-items: center; } .primary-nav-1 media-menu.primary-nav { grid-column-start: hamburger-start; grid-column-end: user-end; } .primary-nav-1 .ia-logo.primary-nav { height: 3rem; width: 2.7rem; display: inline-block; } .primary-nav-1 .ia-wordmark.primary-nav { height: 3rem; width: 9.5rem; } .primary-nav-1 .ia-logo.primary-nav,.primary-nav-1 .ia-wordmark.primary-nav { margin-right: 5px; } .primary-nav-1 .hamburger.primary-nav { -ms-grid-row: 1; -ms-grid-column: 1; grid-area: hamburger; padding: 0; } .primary-nav-1 .hamburger.primary-nav svg.primary-nav { height: 4rem; width: 4rem; fill: #fff; } .primary-nav-1 .mobile-donate-link.primary-nav { display: inline-block; } .primary-nav-1 .mobile-donate-link.primary-nav svg.primary-nav { height: 4rem; width: 4rem; } .primary-nav-1 .mobile-donate-link.primary-nav .fill-color.primary-nav { fill: rgb(255, 0, 0); } .primary-nav-1 .sr-only.primary-nav { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; white-space: nowrap; clip: rect(1px, 1px, 1px, 1px); -webkit-clip-path: inset(50%); clip-path: inset(50%); user-select: none; } .primary-nav-1 .search-trigger.primary-nav { padding: 0; } .primary-nav-1 .search-trigger.primary-nav svg.primary-nav { height: 4rem; width: 4rem; } .primary-nav-1 .search-trigger.primary-nav .fill-color.primary-nav { fill: #999; } .primary-nav-1 .search-activated.primary-nav { position: relative; z-index: 3; } .primary-nav-1 .upload.primary-nav { display: none; } .primary-nav-1 .upload.primary-nav span.primary-nav { display: none; } .primary-nav-1 .upload.primary-nav svg.primary-nav { height: 3rem; width: 3rem; } .primary-nav-1 .screen-name.primary-nav { display: none; font-size: 1.3rem; vertical-align: middle; text-transform: uppercase; } .primary-nav-1 .user-menu.primary-nav { color: #999; padding: 0.5rem; height: 100%; } .primary-nav-1 button.user-menu.primary-nav:hover,.primary-nav-1 button.user-menu.primary-nav:focus { color: #fff; outline: none; } .primary-nav-1 .user-menu.active.primary-nav { border-radius: 1rem 1rem 0 0; background: #333; } .primary-nav-1 .user-menu.primary-nav img.primary-nav { display: block; width: 3rem; height: 3rem; } .primary-nav-1 .link-home.primary-nav { text-decoration: none; display: inline-flex; } .primary-nav-1 a.link-home.primary-nav:focus,.primary-nav-1 a.link-home.primary-nav:focus-visible { outline-offset: 1px; } @media only screen and (min-width: 890px) and (max-device-width: 905px) { .primary-nav-1 .branding.second-logo.primary-nav { padding-right: 0; } } @media (min-width: 906px) { .primary-nav-1 .branding.second-logo.primary-nav { padding-right: 20px; } } @media (max-width: 889px) { .primary-nav-1 slot.primary-nav[name='opt-sec-logo'] { display: none; } .primary-nav-1 .right-side-section.primary-nav { display: initial; } .primary-nav-1 .right-side-section.primary-nav .user-info.primary-nav { float: right; } } @media (min-width: 890px) { .primary-nav-1 { ; } .primary-nav-1 nav.primary-nav { display: flex; z-index: 4; height: 5rem; padding-right: 1.5rem; } .primary-nav-1 slot.primary-nav[name='opt-sec-logo-mobile'] { display: none; } .primary-nav-1 .ia-logo.primary-nav,.primary-nav-1 .ia-wordmark.primary-nav { margin-right: 10px; } .primary-nav-1 .hamburger.primary-nav,.primary-nav-1 .search-trigger.primary-nav,.primary-nav-1 .mobile-donate-link.primary-nav { display: none; } .primary-nav-1 .user-info.primary-nav { display: block; float: right; vertical-align: middle; height: 100%; } .primary-nav-1 .user-info.primary-nav .user-menu.primary-nav img.primary-nav { height: 3rem; width: 3rem; margin-right: 0.5rem; } .primary-nav-1 .user-menu.primary-nav { padding: 1rem 0.5rem; } .primary-nav-1 .user-menu.active.primary-nav { background: transparent; } .primary-nav-1 .user-menu.primary-nav img.primary-nav { display: inline-block; vertical-align: middle; margin-right: 0.5rem; } .primary-nav-1 .upload.primary-nav { display: block; padding: 1rem 0.5rem; float: right; font-size: 1.4rem; text-transform: uppercase; text-decoration: none; color: #999; } .primary-nav-1 .upload.primary-nav:active,.primary-nav-1 .upload.primary-nav:focus,.primary-nav-1 .upload.primary-nav:hover { color: #fff; } .primary-nav-1 .upload.primary-nav:focus-visible { outline: none; } .primary-nav-1 .upload.primary-nav svg.primary-nav { vertical-align: middle; fill: #999; } .primary-nav-1 .upload.primary-nav:hover svg.primary-nav,.primary-nav-1 .upload.primary-nav:focus svg.primary-nav,.primary-nav-1 .upload.primary-nav:active svg.primary-nav { fill: #fff; } .primary-nav-1 nav-search.primary-nav { float: right; margin-left: 1rem; } } @media (min-width: 990px) { .primary-nav-1 .screen-name.primary-nav { display: inline-block; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; max-width: 165px; } .primary-nav-1 .upload.primary-nav span.primary-nav { display: inline; } }</style><style scope="search-menu-1">.search-menu-1 .menu-wrapper.search-menu { position: relative; } .search-menu-1 button.search-menu:focus,.search-menu-1 input.search-menu:focus { outline-color: #428bca; outline-width: 0.16rem; outline-style: auto; outline-offset: 2px !important; } .search-menu-1 .search-menu-inner.search-menu { position: absolute; right: 0; left: 0; z-index: 4; padding: 0 4.5rem; font-size: 1.6rem; background-color: #333; } .search-menu-1 .tx-slide.search-menu { overflow: hidden; transition-property: top; transition-duration: 0.2s; transition-timing-function: ease; } .search-menu-1 .initial.search-menu,.search-menu-1 .closed.search-menu { top: -1500px; } .search-menu-1 .closed.search-menu { transition-duration: 0.2s; } .search-menu-1 label.search-menu,.search-menu-1 a.search-menu { padding: 1rem; display: block; } .search-menu-1 .advanced-search.search-menu { text-decoration: none; color: #428bca; line-height: normal; padding: 0.5rem; margin-top: 5px; } @media (min-width: 890px) { .search-menu-1 .search-menu-inner.search-menu { overflow: visible; right: 2rem; left: auto; z-index: 5; padding: 1rem 2rem; transition: opacity 0.2s ease-in-out; font-size: 1.4rem; color: #333; border-radius: 2px; background: #fff; box-shadow: 0 1px 2px 1px rgba(0, 0, 0, 0.15); } .search-menu-1 .search-menu-inner.search-menu:after { position: absolute; right: 7px; top: -7px; width: 12px; height: 7px; box-sizing: border-box; color: #fff; content: ''; border-bottom: 7px solid currentColor; border-left: 6px solid transparent; border-right: 6px solid transparent; } .search-menu-1 .initial.search-menu,.search-menu-1 .closed.search-menu { opacity: 0; transition-duration: 0.2s; } .search-menu-1 .open.search-menu { opacity: 1; } .search-menu-1 label.search-menu { padding: 0; font-weight: normal; margin: 0; } .search-menu-1 label.search-menu + label.search-menu { padding-top: 7px; } .search-menu-1 a.search-menu { padding: 1rem 0 0 0; } }</style><style scope="wayback-search-1">.wayback-search-1 { font: normal 1.2rem/1.5 'Helvetica Neue', Helvetica, Arial, sans-serif; } .wayback-search-1 form.wayback-search { max-width: 600px; } .wayback-search-1 p.wayback-search { margin-top: 0; font-weight: 200; } .wayback-search-1 a.wayback-search { font-weight: 500; text-decoration: none; color: #fff; } .wayback-search-1 fieldset.wayback-search { padding: 0.7rem 2rem; margin: 1.5rem 0; box-sizing: border-box; text-align: center; border: none; border-radius: 7px; background-color: #fcf5e6; box-shadow: 3px 3px 0 0 #c3ad97; } .wayback-search-1 label.wayback-search { display: none; } .wayback-search-1 img.wayback-search { width: 100%; max-width: 215px; max-height: 60px; margin-bottom: 1.3rem; vertical-align: middle; } .wayback-search-1 input.wayback-search { display: block; width: 100%; height: 3rem; padding: 0.5rem 1rem 0.5rem 2.5rem; font: normal 1.2rem/1.5 'Helvetica Neue', Helvetica, Arial, sans-serif; color: #858585; box-sizing: border-box; border: 1px solid #ccc; border-radius: 2rem; background: #eee; } .wayback-search-1 input.wayback-search:focus { border-color: #66afe9; box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(102, 175, 233, 0.6); outline: none; } .wayback-search-1 .search-field.wayback-search { position: relative; overflow: hidden; } .wayback-search-1 .search-field.wayback-search svg.wayback-search { position: absolute; top: 2px; left: 3px; width: 2.4rem; height: 2.4rem; } .wayback-search-1 .search-field.wayback-search .fill-color.wayback-search { fill: #999; } .wayback-search-1 input.wayback-search:focus + svg.wayback-search { display: none; } @media (min-width: 890px) { .wayback-search-1 form.wayback-search { margin: 0 auto; } .wayback-search-1 p.wayback-search { margin-bottom: 3rem; font-size: 1.6rem; text-align: center; } .wayback-search-1 img.wayback-search { margin: 0; } .wayback-search-1 fieldset.wayback-search { margin: 0 auto; font-size: 0; } .wayback-search-1 fieldset.wayback-search a.wayback-search,.wayback-search-1 .search-field.wayback-search { display: inline-block; width: 50%; vertical-align: middle; } .wayback-search-1 fieldset.wayback-search a.wayback-search { text-align: center; } .wayback-search-1 .search-field.wayback-search svg.wayback-search { width: 2.8rem; height: 2.8rem; } .wayback-search-1 .search-field.wayback-search .fill-color.wayback-search { fill: #333; } } .wayback-search-1 p.wayback-search { margin-bottom: 1rem; font-size: 1.6rem; text-align: center; } .wayback-search-1 fieldset.wayback-search { padding: .5rem; border-radius: 5px; box-shadow: none; } .wayback-search-1 input.wayback-search { padding-left: 3rem; margin-top: .3rem; font-size: 1.4rem; border-color: #bca38e; background: #fff; } .wayback-search-1 input.wayback-search::placeholder,.wayback-search-1 input.wayback-search::-webkit-input-placeholder { color: #8e8e8e; } .wayback-search-1 .search-field.wayback-search svg.wayback-search { top: 50%; transform: translateY(-50%); } @media (min-width: 890px) { .wayback-search-1 fieldset.wayback-search a.wayback-search,.wayback-search-1 .search-field.wayback-search { display: block; width: auto; } .wayback-search-1 fieldset.wayback-search a.wayback-search { margin: 0 1.5rem; } }</style><style scope="save-page-form-1">.save-page-form-1 div.save-page-form { display: grid; grid-template-columns: 1fr auto; grid-column-gap: .8rem; margin: 0; padding: 0; border: none; } .save-page-form-1 input.save-page-form[type="text"] { width: 100%; height: 3rem; box-sizing: border-box; border: 1px solid #999; border-radius: .5rem; color: #222; font-size: inherit; } .save-page-form-1 input.save-page-form[type="submit"] { -webkit-appearance: none; -moz-appearance: none; appearance: none; padding: .4rem .8rem; font: normal 1.3rem 'Helvetica Neue', Helvetica, Arial, sans-serif; text-transform: uppercase; color: #fff; border: none; border-radius: 16px; background: #222; cursor: pointer; } .save-page-form-1 .error.save-page-form { display: none; margin-top: .5rem; font-weight: bold; color: #ffcd27; } .save-page-form-1 .visible.save-page-form { display: block; } @media (min-width: 890px) { .save-page-form-1 h3.save-page-form { margin-top: 0; font: normal 100 1.6rem 'Helvetica Neue', Helvetica, Arial, sans-serif; } }</style><style scope="wayback-slider-1">.wayback-slider-1 h4.wayback-slider { font-size: 1.6rem; } .wayback-slider-1 a.wayback-slider { text-decoration: none; color: #fff; } .wayback-slider-1 ul.wayback-slider { padding: 0; margin: 0; list-style: none; } .wayback-slider-1 li.wayback-slider + li.wayback-slider { padding-top: 1.5rem; } @media (min-width: 890px) { .wayback-slider-1 h4.wayback-slider { margin: 0 0 1rem 0; font-weight: 100; } .wayback-slider-1 ul.wayback-slider { font-size: 1.3rem; } .wayback-slider-1 li.wayback-slider { padding-bottom: .5rem; } .wayback-slider-1 li.wayback-slider + li.wayback-slider { padding-top: 0; } .wayback-slider-1 li.wayback-slider a.wayback-slider { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; } } @media (min-width: 890px) { .wayback-slider-1 { display: block; grid-column: 1 / 4; padding: 0 1.5rem; } .wayback-slider-1 h4.wayback-slider { margin-top: 0; font: normal 100 1.6rem 'Helvetica Neue', Helvetica, Arial, sans-serif; } .wayback-slider-1 .grid.wayback-slider { display: grid; grid-template-columns: minmax(auto, 260px) 1fr minmax(auto, 260px); grid-column-gap: 2.5rem; } .wayback-slider-1 .link-lists.wayback-slider { display: grid; grid-template-columns: calc(50% - 1.25rem) calc(50% - 1.25rem); grid-column-gap: 2.5rem; } }</style><style scope="more-slider-1">.more-slider-1 ul.more-slider { padding: 0; margin: -1rem 0 0 0; list-style: none; } .more-slider-1 a.more-slider { display: block; padding: 1rem 0; text-decoration: none; color: #fff; }</style><style scope="media-subnav-1">.media-subnav-1 h4.media-subnav { font-size: 1.6rem; } .media-subnav-1 a.media-subnav { text-decoration: none; color: #fff; } .media-subnav-1 ul.media-subnav { padding: 0; margin: 0; list-style: none; } .media-subnav-1 li.media-subnav + li.media-subnav { padding-top: 1.5rem; } @media (min-width: 890px) { .media-subnav-1 h4.media-subnav { margin: 0 0 1rem 0; font-weight: 100; } .media-subnav-1 ul.media-subnav { font-size: 1.3rem; } .media-subnav-1 li.media-subnav { padding-bottom: .5rem; } .media-subnav-1 li.media-subnav + li.media-subnav { padding-top: 0; } .media-subnav-1 li.media-subnav a.media-subnav { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; } } .media-subnav-1 img.media-subnav { display: block; width: 90px; height: 90px; margin: 0 auto 1rem auto; border-radius: 45px; } .media-subnav-1 h3.media-subnav { margin-top: 0; font-size: 1.8rem; } .media-subnav-1 .icon-links.media-subnav { display: -webkit-box; display: -ms-flexbox; display: flex; -webkit-box-pack: space-evenly; -ms-flex-pack: space-evenly; justify-content: space-evenly; text-align: center; } .media-subnav-1 .icon-links.media-subnav a.media-subnav { display: inline-block; width: 12rem; margin-bottom: 1.5rem; overflow: hidden; white-space: nowrap; text-align: center; text-overflow: ellipsis; } .media-subnav-1 .icon-links.media-subnav a.media-subnav + a.media-subnav { margin-left: 2rem; } .media-subnav-1 .featured.media-subnav h4.media-subnav { display: none; } @media (min-width: 890px) { .media-subnav-1 { display: -ms-grid; display: grid; -ms-grid-columns: 40% 20% 40%; grid-template-columns: 40% 20% 40%; } .media-subnav-1 .wayback-search.media-subnav { -ms-grid-column: 1; -ms-grid-column-span: 3; grid-column: 1 / 4; } .media-subnav-1 h3.media-subnav { display: none; } .media-subnav-1 .icon-links.media-subnav { -ms-grid-column: 1; } .media-subnav-1 .icon-links.media-subnav a.media-subnav { padding-top: 3.5rem; max-width: 16rem; } .media-subnav-1 .links.media-subnav { padding: 0 1.5rem; } .media-subnav-1 .featured.media-subnav { -ms-grid-column: 2; } .media-subnav-1 .featured.media-subnav h4.media-subnav { display: block; } .media-subnav-1 .top.media-subnav { -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav { display: -ms-grid; display: grid; -ms-grid-columns: 50% 3rem 50%; grid-template-columns: 50% 50%; -ms-grid-rows: (auto)[7]; grid-template-rows: repeat(7, auto); grid-column-gap: 3rem; grid-auto-flow: column; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(1) { -ms-grid-row: 1; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(2) { -ms-grid-row: 2; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(3) { -ms-grid-row: 3; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(4) { -ms-grid-row: 4; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(5) { -ms-grid-row: 5; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(6) { -ms-grid-row: 6; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(7) { -ms-grid-row: 7; -ms-grid-column: 1; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(8) { -ms-grid-row: 1; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(9) { -ms-grid-row: 2; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(10) { -ms-grid-row: 3; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(11) { -ms-grid-row: 4; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(12) { -ms-grid-row: 5; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(13) { -ms-grid-row: 6; -ms-grid-column: 3; } .media-subnav-1 .top.media-subnav ul.media-subnav > *.media-subnav:nth-child(14) { -ms-grid-row: 7; -ms-grid-column: 3; } }</style><style scope="media-slider-1">.media-slider-1 .media-slider-container.media-slider { position: relative; } .media-slider-1 .overflow-clip.media-slider { display: none; position: absolute; top: 3rem; right: 0; left: 0; height: 0; overflow: hidden; transition: height 0.2s ease; } .media-slider-1 .information-menu.media-slider { position: absolute; top: 0; right: 0; left: 0; padding: 0; height: 31.9rem; overflow-x: hidden; font-size: 1.4rem; background: #333; } .media-slider-1 .open.media-slider { display: block; } .media-slider-1 .hidden.media-slider { display: none; } .media-slider-1 .info-box.media-slider { padding: 1rem; } @media (max-width: 889px) { .media-slider-1 .overflow-clip.open.media-slider { display: block; height: 35.8rem; left: 4rem; top: 0; } } @media (min-width: 890px) { .media-slider-1 .overflow-clip.media-slider { display: block; } .media-slider-1 .information-menu.media-slider { left: 0; z-index: 3; height: auto; min-height: 21rem; background: #474747; transform: translate(0, -100%); transition: transform 0.2s ease; } .media-slider-1 .overflow-clip.open.media-slider { height: 22rem; } .media-slider-1 .information-menu.open.media-slider { transform: translate(0, 0); } .media-slider-1 .info-box.media-slider { max-width: 100rem; padding: 1.5rem 0; margin: 0 auto; } }</style><style scope="desktop-subnav-1">.desktop-subnav-1 ul.desktop-subnav { position: relative; z-index: 3; padding: .8rem 0; margin: 0; font-size: 1.2rem; text-transform: uppercase; text-align: center; background: #333; } .desktop-subnav-1 li.desktop-subnav { display: inline-block; padding: 0 15px; } .desktop-subnav-1 a.desktop-subnav { text-decoration: none; color: #aaa; } .desktop-subnav-1 a.desktop-subnav:hover,.desktop-subnav-1 a.desktop-subnav:active,.desktop-subnav-1 a.desktop-subnav:focus { color: #fff; } .desktop-subnav-1 .donate.desktop-subnav svg.desktop-subnav { width: 1.6rem; height: 1.6rem; vertical-align: top; fill: #f00; }</style><style scope="signed-out-dropdown-1">.signed-out-dropdown-1 .nav-container.signed-out-dropdown { position: relative; } .signed-out-dropdown-1 nav.signed-out-dropdown { position: absolute; right: 0; z-index: 4; overflow: hidden; font-size: 1.6rem; background-color: #333; transition-property: top; transition-duration: 0.2s; transition-timing-function: ease; } .signed-out-dropdown-1 .initial.signed-out-dropdown,.signed-out-dropdown-1 .closed.signed-out-dropdown { top: -1500px; } .signed-out-dropdown-1 .closed.signed-out-dropdown { transition-duration: 0.5s; } .signed-out-dropdown-1 .open.signed-out-dropdown { max-width: 100vw; overflow: auto; } .signed-out-dropdown-1 h3.signed-out-dropdown { padding: 0.6rem 2rem; margin: 0; font-size: inherit; overflow: hidden; text-overflow: ellipsis; } .signed-out-dropdown-1 ul.signed-out-dropdown { padding: 0.4rem 0 0.7rem 0; margin: 0; list-style: none; max-height: calc(100vh - 7.2rem + 1px); overflow: auto; box-sizing: border-box; } .signed-out-dropdown-1 .divider.signed-out-dropdown { margin: 0.5rem 0; border-bottom: 1px solid #666; } .signed-out-dropdown-1 a.signed-out-dropdown,.signed-out-dropdown-1 .info-item.signed-out-dropdown { display: block; color: #fff; text-decoration: none; padding: 1rem 2rem; } .signed-out-dropdown-1 .info-item.signed-out-dropdown { font-size: 0.8em; color: #999; } .signed-out-dropdown-1 .callout.signed-out-dropdown { position: absolute; margin-left: 10px; padding: 0 5px; border-radius: 2px; background: #fee257; color: #2c2c2c; font-size: 1.4rem; font-weight: bold; } .signed-out-dropdown-1 a.mobile-upload.signed-out-dropdown { display: flex; justify-content: left; align-items: center; } .signed-out-dropdown-1 a.mobile-upload.signed-out-dropdown svg.signed-out-dropdown { fill: #fff; margin-right: 1rem; height: 1.4rem; width: 1.4rem; } @media (min-width: 890px) { .signed-out-dropdown-1 nav.signed-out-dropdown { display: flex; overflow: visible; top: 0; left: auto; z-index: 5; transition: opacity 0.2s ease-in-out; font-size: 1.4rem; border-radius: 2px; background: #fff; box-shadow: 0 1px 2px 1px rgba(0, 0, 0, 0.15); } .signed-out-dropdown-1 nav.signed-out-dropdown:after { position: absolute; right: 7px; top: -7px; width: 12px; height: 7px; box-sizing: border-box; color: #fff; content: ''; border-bottom: 7px solid currentColor; border-left: 6px solid transparent; border-right: 6px solid transparent; } .signed-out-dropdown-1 h3.signed-out-dropdown { display: none; } .signed-out-dropdown-1 ul.signed-out-dropdown { max-height: calc(100vh - 8.5rem + 1px); } .signed-out-dropdown-1 .divider.signed-out-dropdown { border-bottom-color: #666; } .signed-out-dropdown-1 a.signed-out-dropdown { padding: 0.5rem 2rem; color: #333; transition: background 0.1s ease-out, color 0.1s ease-out; } .signed-out-dropdown-1 .info-item.signed-out-dropdown { padding: 0.5rem 2rem; font-size: 0.8em; } .signed-out-dropdown-1 a.signed-out-dropdown:hover,.signed-out-dropdown-1 a.signed-out-dropdown:active,.signed-out-dropdown-1 a.signed-out-dropdown:focus { color: #fff; background: #428bca; outline: none; } .signed-out-dropdown-1 .initial.signed-out-dropdown,.signed-out-dropdown-1 .closed.signed-out-dropdown { opacity: 0; transition-duration: 0.2s; } .signed-out-dropdown-1 .open.signed-out-dropdown { opacity: 1; overflow: visible; } .signed-out-dropdown-1 a.mobile-upload.signed-out-dropdown { display: none; } } @media (min-width: 890px) { .signed-out-dropdown-1 .initial.signed-out-dropdown,.signed-out-dropdown-1 .closed.signed-out-dropdown,.signed-out-dropdown-1 .open.signed-out-dropdown { right: 33.5rem; } .signed-out-dropdown-1 .search-hidden.initial.signed-out-dropdown,.signed-out-dropdown-1 .search-hidden.closed.signed-out-dropdown,.signed-out-dropdown-1 .search-hidden.open.signed-out-dropdown { right: 18.5rem; } } @media (min-width: 990px) { .signed-out-dropdown-1 .initial.signed-out-dropdown,.signed-out-dropdown-1 .closed.signed-out-dropdown,.signed-out-dropdown-1 .open.signed-out-dropdown { right: 40rem; } .signed-out-dropdown-1 .search-hidden.initial.signed-out-dropdown,.signed-out-dropdown-1 .search-hidden.closed.signed-out-dropdown,.signed-out-dropdown-1 .search-hidden.open.signed-out-dropdown { right: 26rem; } }</style><style scope="ia-topnav-1">.ia-topnav-1 { ; color: #fff; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; } .ia-topnav-1 primary-nav.ia-topnav:focus { outline: none !important; } .ia-topnav-1 #close-layer.ia-topnav { display: none; position: fixed; top: 0; right: 0; bottom: 0; left: 0; z-index: 3; } .ia-topnav-1 #close-layer.visible.ia-topnav { display: block; } .ia-topnav-1 .topnav.ia-topnav { position: relative; z-index: 4; } @media (max-width: 889px) { .ia-topnav-1 desktop-subnav.ia-topnav { display: none; } }</style><style>body {transition: opacity ease-in 0.2s; } body[unresolved] {opacity: 0; display: block; overflow: hidden; position: relative; } </style> <ia-topnav locallinks="true" waybackpagesarchived="916 billion" class="x-scope ia-topnav-1"> <div class="topnav style-scope ia-topnav"> <primary-nav class="style-scope ia-topnav x-scope primary-nav-1"> <nav class="style-scope primary-nav"> <button class="hamburger style-scope primary-nav" title="Open main menu" data-event-click-tracking="TopNav|NavHamburger"> <icon-hamburger class="style-scope primary-nav x-scope icon-hamburger-1"> <svg viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg" aria-labelledby="hamburgerTitleID hamburgerDescID" class="style-scope icon-hamburger"> <title id="hamburgerTitleID" class="style-scope icon-hamburger">Hamburger icon</title> <desc id="hamburgerDescID" class="style-scope icon-hamburger">An icon used to represent a menu that can be toggled by interacting with this icon.</desc> <path d="m30.5 26.5c.8284271 0 1.5.6715729 1.5 1.5s-.6715729 1.5-1.5 1.5h-21c-.82842712 0-1.5-.6715729-1.5-1.5s.67157288-1.5 1.5-1.5zm0-8c.8284271 0 1.5.6715729 1.5 1.5s-.6715729 1.5-1.5 1.5h-21c-.82842712 0-1.5-.6715729-1.5-1.5s.67157288-1.5 1.5-1.5zm0-8c.8284271 0 1.5.6715729 1.5 1.5s-.6715729 1.5-1.5 1.5h-21c-.82842712 0-1.5-.6715729-1.5-1.5s.67157288-1.5 1.5-1.5z" fill="#999" fill-rule="evenodd" class="style-scope icon-hamburger"></path> </svg> </icon-hamburger> </button> <div class="branding style-scope primary-nav"> <a title="Go home" class="link-home style-scope primary-nav" href="/" data-event-click-tracking="TopNav|NavHome"> <svg class="ia-logo style-scope primary-nav" viewBox="0 0 27 30" xmlns="http://www.w3.org/2000/svg" aria-labelledby="logoTitleID logoDescID"> <title id="logoTitleID" class="style-scope primary-nav">Internet Archive logo</title> <desc id="logoDescID" class="style-scope primary-nav">A line drawing of the Internet Archive headquarters building fa莽ade.</desc> <g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" class="style-scope primary-nav"> <mask id="mask-2" fill="white" class="style-scope primary-nav"> <path d="M26.6666667,28.6046512 L26.6666667,30 L0,30 L0.000283687943,28.6046512 L26.6666667,28.6046512 Z M25.6140351,26.5116279 L25.6140351,28.255814 L1.05263158,28.255814 L1.05263158,26.5116279 L25.6140351,26.5116279 Z M3.62469203,7.6744186 L3.91746909,7.82153285 L4.0639977,10.1739544 L4.21052632,13.9963932 L4.21052632,17.6725617 L4.0639977,22.255044 L4.03962296,25.3421929 L3.62469203,25.4651163 L2.16024641,25.4651163 L1.72094074,25.3421929 L1.55031755,22.255044 L1.40350877,17.6970339 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Chemistry of the elements : Greenwood, N. N. (Norman Neill) : Free Download, Borrow, and Streaming : Internet Archive