33As
Arsenic
비소 · ヒ素
Metalloid
Atomic number33
ElementAs — Arsenic
Atomic mass74.922
CategoryMetalloid
Group15
Period4
Electron config[Ar] 3d10 4s2 4p3
Shells2,8,18,5
State (RT)Solid
Melting pt817°C
Boiling pt615°C
Electronegativity2.18
Discovered1250
Main usesSemiconductors, wood preservative
2 · 8 · 18 · 5