Periodic Table of the Elements: Selenium

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Periodic Table of the Elements: Selenium
Atomic Number:34
Atomic Symbol:Se
 Seleniumselenium
, nonmetallic chemical element; symbol Se; at. no. 34; at. wt. 78.96; m.p. 217&degC;; b.p. about 685&degC;; sp. gr. 4.81 at 20&degC;; valence −2, +4, or +6. Selenium is directly below sulfur in Group 16 of the periodic table.
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Atomic Weight:78.96
Electron Configuration:2 · 8 · 18 · 6