Ca
Calcium
20
Atomic Number: 20
Atomic mass: 40.0784
Ionization energy: 590
Electronaffinity: -2
Covalent radius: 174
Calculated radius: 194
Empirical radius: 180
Vanderwaals radius:
Electronegativity: 1
Density: 1.55
Oxidation states: 2
Melting point: 1115
Boiling point: 1757
Electron configuration: [Ar] 4s2
Element group: 2
Element period: 4

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