Arsenic

Symbol | As
Latin name | Arsenicum
Atomic number | 33
Period | 4
Element category | Metalloids
Relative atomic mass | 74.92159
Group | V.A
Electronegativity | 2.0
Oxidation numbers | -3, 3, 5
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3
Density [g/cm3] | 4.7
State | Solid
Melting point [°C] | 817
Boiling point [°C] | 613
Atomic radius [pm] | 114
Covalent radius [pm] | 119
Thermal conductivity [W m-1K-1] | 50
Heat capacity [J K-1g-1] | 0.33
Discovery | 1250
Hardness [Mohs scale] | 3.5
Brinell hardness [MPa] | 1440
Young's modulus [GPa] | 8
Electrical conductivity [S m-1] | 3.3 · 106
1.st ionization energy [eV] | 9.8152
2.nd ionization energy [eV] | 18.633
3.rd ionization energy [eV] | 28.351
Stable isotopes | 1
Unstable isotopes | 13