Periodic Table of Elements: Selenium

Symbol: Se Atomic number: 34 Electron configuration: [Ar] 3d104s24p4 Atomic mass: 78.96 u Melting point: 429.5°F (220.8°C) Atomic radius: 120 pm Chemical series: Nonmetal, Chalcogen, Period 4 element Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. He had shares in a sulfuric acid works and he was intrigued by a red-brown sediment which collected at the bottom of the chambers in which the acid was made.

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