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Compare Calcium vs Strontium

Comparing Calcium (Ca) and Strontium (Sr). Atomic numbers 20 and 38 with atomic masses 40.078 u and 87.621 u, classified as alkaline earth metal and alkaline earth metal. Below: a side-by-side comparison of their physical, atomic, electron-configuration and historical properties, including density, melting and boiling points, ionization energies, oxidation states and discovery history.

vs
Ca
Calcium
#20
Sr
Strontium
#38

Periodic properties of the elements

CalciumStrontium
SymbolCaSr
Atomic number2038
Group22
Period45
Blockds
Element categoryAlkaline Earth MetalAlkaline Earth Metal

Physical properties

CalciumStrontium
Phase at STPSolidSolid
Density1.55 g/cm32.64 g/cm3
Atomic weight40.0784 u87.621 u
Melting point1115 K
841.85 °C
1547.33 °F		1050 K
776.85 °C
1430.33 °F
Boiling point1757 K
1483.85 °C
2702.93 °F		1650 K
1376.85 °C
2510.33 °F

Atomic properties

CalciumStrontium
Electronegativity (Pauling Scale)10.95
Electron affinity2.37 kJ/mol5.023 kJ/mol
Oxidation states+1, +2
(a strongly basic oxide)		+1, +2
(a strongly basic oxide)
Ionization energies
  1. 589.8 kJ/mol
  2. 1145.4 kJ/mol
  3. 4912.4 kJ/mol
  4. 6491 kJ/mol
  5. 8153 kJ/mol
  6. 10496 kJ/mol
  7. 12270 kJ/mol
  8. 14206 kJ/mol
  9. 18191 kJ/mol
  10. 20385 kJ/mol
  11. 57110 kJ/mol
  12. 63410 kJ/mol
  13. 70110 kJ/mol
  14. 78890 kJ/mol
  15. 86310 kJ/mol
  16. 94000 kJ/mol
  17. 104900 kJ/mol
  18. 111711 kJ/mol
  19. 494850 kJ/mol
  20. 527762 kJ/mol
  1. 549.5 kJ/mol
  2. 1064.2 kJ/mol
  3. 4138 kJ/mol
  4. 5500 kJ/mol
  5. 6910 kJ/mol
  6. 8760 kJ/mol
  7. 10230 kJ/mol
  8. 11800 kJ/mol
  9. 15600 kJ/mol
  10. 17100 kJ/mol
  11. 31270 kJ/mol

Electron configuration

CalciumStrontium
Shorthand configuration[Ar] 4s2 [Kr] 5s2
Full configuration1s2 2s2 2p6 3s2 3p6 4s2 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
Electrons per shell2, 8, 8, 22, 8, 18, 8, 2

History

CalciumStrontium
DiscoveryHumphry Davy (1808)William Cruickshank (1787)
First isolationHumphry Davy (1808)Humphry Davy (1808)
Named byHumphry Davy (1808)
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