Element Arsenic (As)

Atomic number 33 · metalloid · Atomic mass 74.922 u

Atomic Mass
74.9220 u
Element Properties
Atomic Number 33
Atomic Mass 74.9220 u
Category metalloid / 准金属
Group 15
Period 4
Block P
Electron Configuration [Ar] 3d¹⁰ 4s² 4p³
Electronegativity (Pauling) 2.18
Phase at STP Solid
Density 5.727 g/cm³
Year Discovered

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