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Arsenic

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name Arsenic
latin Arsenicum
french Arsenic
german Arsen
symbol As
proton number 33
atomic weight 74.9216
Pauling electronegativity 2.18
electronic configuration [Ar] 3d104s24p3
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melting point 1090 K, 817°C, 1502°F
boiling point 887 K, 614°C, 1137°F
group 15
period 4
state (by 20°C) solid
oxidation states -3, +3, +5
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Discoverer

Year of discovery Discoverer
1250 Albertus Magnus (1200-1280)

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