{"id":2463,"date":"2025-06-27T14:37:03","date_gmt":"2025-06-27T09:07:03","guid":{"rendered":"https:\/\/texpertssolutions.com\/notes\/?p=2463"},"modified":"2025-06-29T16:44:53","modified_gmt":"2025-06-29T11:14:53","slug":"selenium-se","status":"publish","type":"post","link":"https:\/\/texpertssolutions.com\/notes\/2025\/06\/27\/selenium-se\/","title":{"rendered":"Selenium (Se)"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\ud83d\udd39 Basic Information<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Element Name<\/strong>: Selenium<\/li>\n\n\n\n<li><strong>Discovered By<\/strong>: J\u00f6ns Jacob Berzelius<\/li>\n\n\n\n<li><strong>Year of Discovery<\/strong>: 1817<\/li>\n\n\n\n<li><strong>Category<\/strong>: Nonmetal<\/li>\n\n\n\n<li><strong>Group<\/strong>: 16 (Group VIA \u2013 Chalcogens)<\/li>\n\n\n\n<li><strong>State at Room Temperature<\/strong>: Solid (gray, red, or black forms) \u26ab\ud83d\udd34<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Selenium is a <strong>nonmetal<\/strong> with properties similar to sulfur. It exists in different forms \u2014 including <strong>shiny gray crystals<\/strong> or <strong>red powder<\/strong> \u2014 and it plays a surprising role in <strong>electronics, health, and industry<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd38 Chemical Properties<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chemical Symbol<\/strong>: Se<\/li>\n\n\n\n<li><strong>Atomic Number<\/strong>: 34<\/li>\n\n\n\n<li><strong>Atomic Mass<\/strong>: ~78.96 u<\/li>\n\n\n\n<li><strong>Valency<\/strong>: Usually 2, 4, or 6<\/li>\n\n\n\n<li><strong>Electronic Configuration<\/strong>: [Ar] 3d\u00b9\u2070 4s\u00b2 4p\u2074<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Selenium is <strong>moderately reactive<\/strong> and forms compounds like <strong>selenides and selenates<\/strong>. It behaves both like a nonmetal and a metalloid in some ways, especially in electrical conductivity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcd8 Basic Things to Know<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Selenium was named after the <strong>Greek word \u201cSelene,\u201d<\/strong> meaning <strong>Moon<\/strong>, because it was discovered shortly after tellurium (named after Earth \ud83c\udf0d).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s found in <strong>metal ores and soil<\/strong>, and is <strong>essential in small amounts<\/strong> for humans and animals \u2014 but can be <strong>toxic in large doses<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udd14 Interesting Facts<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Selenium is a <strong>semiconductor<\/strong>, meaning it can conduct electricity under certain conditions \u2014 like light exposure. \ud83d\udca1\u26a1<\/li>\n\n\n\n<li>It\u2019s used in <strong>solar panels and photocopiers<\/strong>.<\/li>\n\n\n\n<li>In tiny amounts, selenium is <strong>important for our health<\/strong>, supporting the <strong>immune system and thyroid<\/strong>. \ud83e\udde0<\/li>\n\n\n\n<li>Some types of glass contain selenium to <strong>reduce glare and color<\/strong>. \ud83e\ude9f<\/li>\n\n\n\n<li>Plants absorb selenium from soil \u2014 so it&#8217;s in our food chain naturally. \ud83c\udf3e\ud83e\udd57<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd27 Common Uses<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Glass Manufacturing<\/strong>: Used to remove color and tint glass reddish for aesthetics. \ud83d\udd34<\/li>\n\n\n\n<li><strong>Electronics<\/strong>: Selenium is used in <strong>solar cells, light sensors, and rectifiers<\/strong>. \u26a1\ud83d\udd0b<\/li>\n\n\n\n<li><strong>Health Supplements<\/strong>: Found in <strong>vitamins and mineral supplements<\/strong> in trace amounts. \ud83d\udc8a<\/li>\n\n\n\n<li><strong>Pigments<\/strong>: Used to color <strong>plastics, ceramics, and paints<\/strong>. \ud83c\udfa8<\/li>\n\n\n\n<li><strong>Photography<\/strong> (historically): Was once used in <strong>photocopying and light meters<\/strong>. \ud83d\udcf7<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcda Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Selenium is a <strong>versatile and essential nonmetal<\/strong> with surprising roles in <strong>technology, health, and industry<\/strong>. From <strong>solar panels to supplements<\/strong>, it\u2019s a great example of how elements work behind the scenes to improve modern life. For students, selenium shows how <strong>tiny atoms can have powerful effects!<\/strong> \ud83c\udf1f\ud83d\udd2c<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd39 Basic Information Selenium is a nonmetal with properties similar to sulfur. It exists in different forms \u2014 including shiny gray crystals or red powder \u2014 and it plays a surprising role in electronics, health, and industry. \ud83d\udd38 Chemical Properties Selenium is moderately reactive and forms compounds like selenides and selenates. It behaves both like&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2802,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[672],"tags":[656,652,653,661,647,643,648,670,666,664,662,650,651,645,660,663,655,646,657,659,658,665,642,644,668,669,667,649,671,654],"class_list":["post-2463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-periodic-table-for-students","tag-actinides","tag-alkali-metals","tag-alkaline-earth-metals","tag-atomic-mass","tag-atomic-number","tag-chemical-elements","tag-chemical-symbols","tag-chemistry-basics","tag-chemistry-study-guide","tag-electron-configuration","tag-electronegativity","tag-element-groups","tag-element-periods","tag-element-properties","tag-halogens","tag-ionization-energy","tag-lanthanides","tag-mendeleev-periodic-table","tag-metalloids","tag-noble-gases","tag-nonmetals","tag-oxidation-states","tag-periodic-table","tag-periodic-table-elements","tag-periodic-table-explained","tag-periodic-table-facts","tag-periodic-table-for-students","tag-periodic-trends","tag-science-education","tag-transition-metals"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\ud83d\udd39 Basic Information Element Name: Selenium Discovered By: J\u00f6ns Jacob Berzelius Year of Discovery: 1817 Category: Nonmetal Group: 16 (Group VIA \u2013 Chalcogens) State at Room Temperature: Solid (gray, red, or black forms) \u26ab\ud83d\udd34 Selenium is a nonmetal with properties similar to sulfur. 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