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33 - Arsenic metalloid

Discovered by Bronze Age in 1250

Arsenic

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
Shell Electrons Orbitals
1 2 2 in 1s
2 8 2 in 2s + 6 in 2p
3 18 2 in 3s + 6 in 3p + 10 in 3d
4 5 2 in 4s + 3 in 4p
ArsenicAs Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5
74.92  u Atomic Mass
1.3  Å Atomic Radius
887  K Boiling Point
1.19  Å Covalent Radius
5.73  g/cm³ Density
77.65 Electron Affinity
2.18 Electronegativity
9.79  eV First Ionization Energy
1090.15  K Melting Point
4 Number of Shells
5 Electron Valency
33 Atomic Number
2, 8, 18, 5 Electron Shell Occupations
0.33  J/(g K) Specific Heat