Calcium

Latin nameCalcium
English nameCalcium
chemica symbolCa
atomic number20
relative atomic mass40,078
period4
groupII.A
classificationalkaline earth metals
discovery year1808
discovererH. Davy
melting point [°C]839
boiling point [°C]1484
density [g cm-3]1,55
density at melting point [g cm-3]1,378
electronegativity [Pauling]1,0
oxidation statesII
electron configuration[Ar]4s2
specific heat [J g-1K-1]0,63
heat of fusion [kJ mol-1]8,54
thermal conductivity [W m-1 K-1]201
el. conductivity [S m-1]3,13.107
1. ionizing potential [eV]6,1132
2. ionizing potential [eV]11,871
3. ionizing potential [eV]50,908
Mohs hardness1,75
Brinell hardness [MPa]167
shear modulus [GPa]7,4
Young's modulus [GPa]20
state at normal conditionssolid

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