Potassium
Symbol
K
Atomic Number
19
Atomic Weight
39.0983
Element Classification
Discovered By
Sir Humphrey Davy
Discovery Date
1807 (England)
Name Origin
English: pot ash; symbol from Latin: kalium, (alkali).
Density (g/cc)
0.856
Melting Point (K)
336.8
Boiling Point (K)
1047
Appearance
Soft, waxy, silvery-white metal
Atomic Radius (pm)
235
Atomic Volume (cc/mol)
45.3
Covalent Radius (pm)
203
Ionic Radius
133 (+1e)
Specific Heat
0.753
Fusion Heat (kJ/mol)
102.5
Evaporation Heat (kJ/mol)
2.33
Thermal Conductivity (@25°C W/m K)
79.0
Debye Temperature (K)
100.00
Pauling Negativity Number
0.82
First Ionizing Energy (kJ/mol)
418.5
Oxidation States
1
Electronic Configuration
[Ar] 4s1
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
5.230
Lattice C/A Ratio
n/a
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