← Back to periodic table
Arsenic (As)
Atomic number: 33 · Category: metalloid · Group 15 · Period 4 · Phase: Solid
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.
Block: p
Molar heat: 24.64
CPK color:#bd80e3
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
Configuration (semantic): [Ar] 3d10 4s2 4p3
Shells: 2, 8, 18, 5
Electronegativity (Pauling): 2.18
Electron affinity: 77.65
Ionization energies: 947, 1798, 2735, 4837, 6043, 12310
Periodic position
Group: 15
Period: 4
xpos: 15
ypos: 4
Spectral/Bohr images
Image
3D Model