Symbol:
As
Atomic Number:
33
Atomic Weight:
74.92159
Element Classification:
Discovered By:
Known to the ancients.
Discovery Date:
n/a (Unknown)
Name Origin:
Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment).
Density (g/cc):
5.73 (grey arsenic)
Melting Point (K):
1090
Boiling Point (K):
876
Appearance:
Steel gray, brittle semimetal
Atomic Radius (pm):
139
Atomic Volume (cc/mol):
13.1
Covalent Radius (pm):
120
Ionic Radius:
46 (+5e) 222 (-3e)
Specific Heat:
0.328
Fusion Heat (kJ/mol):
n/a
Evaporation Heat (kJ/mol):
32.4
Thermal Conductivity (@25°C W/m K):
(50.2)
Debye Temperature (K):
285.00
Pauling Negativity Number:
2.18
First Ionizing Energy (kJ/mol):
946.2
Oxidation States:
5, 3, -2
Electronic Configuration:
[Ar] 3d10 4s2 4p3
Lattice Structure:
Rhombohedral(RHL)
Lattice Constant:
4.130
Lattice C/A Ratio:
n/a
