33 - Arsenic metalloid

Discovered by Bronze Age in 1250

  • Atomic Radius (Å)
  • Cividis
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.

H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
 Shell Electrons Orbitals
122 in 1s
282 in 2s + 6 in 2p
3182 in 3s + 6 in 3p + 10 in 3d
452 in 4s + 3 in 4p
ArsenicAsElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 9Electron 10Electron 11Electron 12Electron 13Electron 14Electron 15Electron 16Electron 17Electron 18Electron 1Electron 2Electron 3Electron 4Electron 5
metallic grey Appearance
74.9  u Atomic Mass
1.15  Å Atomic Radius
887  K Boiling Point
15 Group
-3, 3, 5 Common Oxidation States
1.19  Å Covalent Radius
5.73  g/cm³ Density
77.7  kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 Electron Configuration
[Ar] 3d10 4s2 4p3 Electron Configuration (semantic)
2.18 Electronegativity
33 Electrons
9.79  eV First Ionization Energy
-3, -2, -1, 2, 3, 5 ICSD Oxidation States
947, 1798, 2735, 4837, 6043, 12310  kJ/mol Ionization Energies
1.09k  K Melting Point
89 Mendeleev Number
24.6  J/(mol·K) Molar Heat
4 Number of Shells
5 Electron Valency
42 Neutrons
33 Atomic Number
14 Number of Isotopes
-3, 2, 3, 5 Oxidation States
4 Period
Solid Phase
33 Protons
2, 8, 18, 5 Electron Shell Occupations
0.329  J/(g K) Specific Heat