Periodic table of elements

20 - Calcium [Ca]

20: Calcium - Calcium [Ca]
Group: 2
Period: 4
Atomic number: 20
Atomic mass: 40.078
Configuration: [Ar] 4s2
Atomic radius: 194 pm
Covalent radius: 176 pm
Electron affinity: 2.37 eV
Ionization energy: 6.1132 eV
Electronic term: 1S0
Mass fraction in the earth crust: 0.05
Mass fraction in the earth space: 0.00007
Electronegativity: 1

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