Selenium

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Selenium is a chemical element, having the chemical symbol Se.

Selenium
78.96(3)



  Se
34
[Ar] 4s2 3d10 4p4
[ ? ] Non-Metal:

Its atomic number (the number of protons) is 34. It has a Standard Atomic Weight of 78.96(3), and is typically found as a solid in its elemental form.

Selenium is considered to be a member of the "Non-Metal" class of elements, has a boiling point of 685 °C , and a melting point of 220.5 °C .

Role in health

Deficiency of selenium may cause heart failure.[1]

References