Atomic Number: 20

Name: Calcium

Atomic symbol: Ca

Atomic Weight: 40.08

Electron configuration: 1s²2s²2p⁶3s²3p⁶4s²

Ionization energies: 590 kJ/mol; 1,145 kJ/mol; 4,912 kJ/mol

Pauling electronegativity: 1.0

Melting Point: 839^oC

Boiling Point: 1484^oC

Density: 1.54 g/cm³

Standard potential (volts), M⁺ + e^- ---> M: -2.76

Covalent radius: 1.74 angstroms

Ionic radius: 1.14 angstroms (+1), 0.99 angstroms (+2)