Arsenic

Metalloid

Symbol: As

Atomic Number: 33

Standard State: Solid

Atomic Mass: 74.92159

Electron Configuration: [Ar]4s2 3d10 4p3

Electronegativity: 2.18

Atomic Radius: 185

Ionization Energy: 9.815

Melting Point: 1090

Boiling Point: 887

Density: 5.776

Year Discovered: Ancient