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==1. What is Selenium?==
==1. What is Selenium?==
Selenium is a trace element that, like iodine, is required in only very small quantities. Chemically it is classified as a semi-metal or metalloid element and can exist in four oxidation states: 2-, 0, 4+ and 6+. This accounts for its existence in several different forms in nature, e.g. as 4+ in sodium selenite (Na2SeO3), 6+ in sodium selenate (Na2SeO4) and 2- in selenocysteine.
Selenium is a trace element that, like iodine, is required in only very small quantities. Chemically it is classified as a semi-metal or metalloid element and can exist in four oxidation states: 2-, 0, 4+ and 6+. This accounts for its existence in several different forms in nature, e.g. as 4+ in sodium selenite (Na<sub>2</sub>SeO<sub>3</sub>), 6+ in sodium selenate (Na<sub>2</sub>SeO<sub>4</sub>) and 2- in selenocysteine.
==2. Why is it Important?==
==2. Why is it Important?==