3 June 2022 Bulletin

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Selenium is a chemical element with symbol Se and atomic number 34.[1] It is an odourless metalloid (an element which has both metallic and non-metallic properties). It can be a grey (the ‘metallic’ and most stable form), red or black solid. [2] In nature selenium is usually combined with sulphide minerals or with silver, copper, lead, and nickel. [3]

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