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Calcium


4
20
40.078
KEY
Chemical Element Symbol Key

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Calcium
Columbia Encyclopedia
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Symbol: Ca
Atomic Number: 20
Atomic Weight: 40.078
Element Classification: Alkaline-earth Metal
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 (@20°C J/g mol): 0.653
Fusion Heat (kJ/mol): 9.20
Evaporation Heat (kJ/mol): 153.6
Thermal Conductivity (@25°C W/m K):
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 (Å): 5.580
Lattice C/A Ratio: n/a


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