Periodic Table of the Elements
Periodic Table




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name Calcium
latin Calcium
french Calcium
german Calcium
symbol Ca
proton number 20
atomic weight 40.078
Pauling electronegativity 1
electronic configuration [Ar] 4s2
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melting point 1115 K, 842°C, 1547°F
boiling point 1757 K, 1484°C, 2703°F
group 2
period 4
state (by 20°C) solid
oxidation states +2
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Year of discovery Discoverer
1808 Sir Humphry Davy (1778-1829)

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