Calcium
Symbol
Ca
Atomic Number
20
Atomic Weight
40.078
Element Classification
Discovered By
Sir Humphrey Davy
Discovery Date
1808 (England)
Name Origin
Latin: calx, calcis (lime).
Density (g/cc)
1.55
Melting Point (K)
1112
Boiling Point (K)
1757
Appearance
Fairly hard, silvery-white metal
Atomic Radius (pm)
197
Atomic Volume (cc/mol)
29.9
Covalent Radius (pm)
174
Ionic Radius
99 (+2e)
Specific Heat
0.653
Fusion Heat (kJ/mol)
9.20
Evaporation Heat (kJ/mol)
153.6
Thermal Conductivity (@25°C W/m K)
(201)
Debye Temperature (K)
230.00
Pauling Negativity Number
1.00
First Ionizing Energy (kJ/mol)
589.4
Oxidation States
2
Electronic Configuration
[Ar] 4s2
Lattice Structure
Face-Centered Cubic(FCC)
Lattice Constant
5.580
Lattice C/A Ratio
n/a
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