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itemprop="name">Periodic Table of the Elements</h1> <p id="breadcrumbs"><span xmlns:v="http://rdf.data-vocabulary.org/#"><span typeof="v:Breadcrumb"><a href="/" rel="v:url" property="v:title">Home</a> <i class="fa fa-angle-right"></i> <span rel="v:child" typeof="v:Breadcrumb"><a href="/mining-minerals-information/" rel="v:url" property="v:title">Mining & Minerals Information</a> <i class="fa fa-angle-right"></i> <span class="breadcrumb_last"><a href="/mining-minerals-information/periodic-table-of-the-elements/" rel="v:url" property="v:title">Periodic Table of the Elements</a></span></span></span></span></p> </div> </header> <div class="wrap"> <div class="primary content-area"> <article id="post-211" class="post-211 elements type-elements status-publish hentry" itemscope itemType="http://schema.org/WebPage"> <div class="entry-content" itemprop="mainContentOfPage"> <div class="mec-db-entry__return-button-row"> <a href="/mining-minerals-information/periodic-table-of-the-elements/" class="smart-back"> <button class="mec-db-entry__return-button mec-button-light"> <i class="fa fa-angle-left" aria-hidden="true"></i>  Return to Periodic Table </button> </a> </div> <h1 class="mec-db-entry__title"><span class="mec-db-entry__element-number">34</span><span class="mec-db-entry__element-symbol">Se</span> Selenium</h1> <div class="mec-db-entry__details-grid"> <div class="mec-db-entry__details-grid-cell"> <h3 class="mec-db-entry__subtitle">Year Discovered</h3> <p>1817</p> <h3 class="mec-db-entry__subtitle">Discovered By</h3> <p>Jons Jakob Berzelius of Sweden</p> </div> <div class="mec-db-entry__details-grid-cell"> <h3 class="mec-db-entry__subtitle">Biological Rating</h3> <div class="mec-db-entry__biological-icon mec-db-entry__biological-icon--all-life"></div> <p>Necessary for all life.</p> </div> </div> <h3 class="mec-db-entry__subtitle">Description</h3> <p>Named from the Greek word meaning “moon,” selenium is a metalloid element that occurs in at least three forms: a gray metallic form, a deep red or black powder, and a red crystalline form. It is stable in air, water and most acids, but reactive to alkalis. Selenium conducts different amounts of electricity, depending on how much light is hitting it. It also can convert light to electricity. Consequently, it is used in photoelectric cells, light meters, TV cameras, photocopiers, solar cells and semi-conductors. Selenium can convert AC electric current to DC current and is used in such converters. It is the active ingredient in dandruff-prevention shampoos, and is a cutting agent in rubber. Selenium can remove color from glass, or it can add a red color to it. It is also used in alloys, especially with steel.</p> <ul class="wwm_social_share wwm_top_left"><li class="wwm_facebook"></li><li class="wwm_twitter"></li><li class="wwm_pinit"></li></ul><input type="hidden" id="wwm_short_url" value=""/><input type="hidden" id="force_fix" value="0" /><input type="hidden" id="wwm_mode" value="1"/> <h3 class="mec-db-entry__subtitle">Biological Benefits</h3> <p>In tiny amounts, it is essential to some species, including humans. Its role seems to be that of a cleanser or protector; it shields against cancers and other diseases by scavenging for free radical oxidants and some heavy metals. Natural selenium deficiency in rocks and soils may be related to the incidence of stroke in humans, and excess selenium can cause deformities and disease in animals.</p> <h3 class="mec-db-entry__subtitle">Role in Life Processes</h3> <div class="mec-db-entry__biological-icon mec-db-entry__biological-icon--all-life"></div> <p>Necessary for full health in plants and animals.</p> <p>Percentage Amount in the Human Body: 0.00002%</p> <h3 class="mec-db-entry__subtitle">Sources</h3> <p>Selenium minerals are rare, and although selenium-rich ores exist, few are mined exclusively for the element. Most selenium is obtained as a by-product of copper ore processing. Selenium is occasionally found in pure form. It occurs in the rare minerals clausthalite and crooksite. Despite the name, the mineral selenite actually contains no selenium. Selenium is mined in China, Japan, Russia, Germany, Belgium, and other countries, including the United States.</p> <div class="mec-db-entry__return-button-row"> <a href="/mining-minerals-information/periodic-table-of-the-elements/"> <button class="mec-db-entry__return-button mec-button-light"> <i class="fa fa-angle-left" aria-hidden="true"></i>  Return to Periodic Table </button> </a> </div> </div> </article> </div> <div class="secondary widget-area" role="complementary"> <aside id="text-2" class="widget widget_text"><h4 class="widget-title">MEC Spotlight</h4> <div class="textwidget"><h1>2024 MEC Mineral Baby</h1> <p><img loading="lazy" decoding="async" class="alignnone size-large wp-image-8445" src="https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-1024x791.jpg" alt="" width="1024" height="791" srcset="https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-1024x791.jpg 1024w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-300x232.jpg 300w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-1536x1187.jpg 1536w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-150x116.jpg 150w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-388x300.jpg 388w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr-600x464.jpg 600w, https://mineralseducationcoalition.org/wp-content/uploads/MEC-Mineral-Baby-2024-Large_front_hr.jpg 1900w" sizes="auto, (max-width: 1024px) 100vw, 1024px" />The MEC Mineral Baby details the estimated amount of minerals, metals and fuels that an American born this year will use in their lifetime. A companion graphic shows how many pounds of new minerals must be provided for every person in the United States each year to make the things we use daily. 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