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Arsenic

As Arsenic
33
74.92159
4
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

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Arsenic

Columbia Encyclopedia

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