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Atomic symbol - Se
Atomic weight - 78.96
Atomic number - 34
Electron configuration - 2-8-18-6
Oxidation states - +4, +6, -2
State of matter - solid
Non-metal
Discovered in 1818 by J.ns Jacob Berzelius
Boils at 685 .C, melts at 50 or 217 .C

Notes:
Selenium occurs in both the amorphous and gray states, that is why it has two
melting points. Both are listed respectively. It is very similar in both
chemical and physical properties to sulphur and tellurium. It is a metalliod.
In the amorphous form it is red when in powder form and adn black when in a
glassy form. It can convert light directly into electricity and thus makes a
good element for solar cells. It can convert AC power to DC and thus makes a
good rectifier.

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