Potassium Scandium

Calcium (Ca)

From Wikipedia, the free encyclopediaCalcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.
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Calcium in the periodic table

SymbolCa
Atomic number20
Group3
Period4
Blockd
Element categoryAlkaline Earth Metal

Physical properties

Phase at STPSolid
Density1.55 g/cm3
Atomic weight40.0784 u
Melting point1115 K
841.85 °C
1547.33 °F
Boiling point1757 K
1483.85 °C
2702.93 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1
Electron affinity2.37 kJ/mol
Ionization energies
1589.8 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

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 4s2
Electrons per shell2, 8, 8, 2

History

Discovered1808
Discovered byHumphry Davy