Periodic table of the elements
PotassiumCalciumScandium
20
Ca
Calcium
40.078
2
8
8
2
20
Ca
Calcium
40.078
2
8
8
2
General
NameCalcium
SymbolCa
Number20
Chemical seriesAlkaline earth metals
Group / Period2 / 4
Blocks-block
CAS registry number7440-70-2

Physical properties
Statesolid
Density1.55 g/cm3
Melting point1115 K (842°C, 1548°F)
Boiling point1757 K (1484°C, 2703°F)
Critical point

Atomic properties
Atomic Weight40.078 g/mol
Crystal structurecubic face centered
Electronegativity1.00
Atomic radius180 pm
Atomic radius (calculated)194 pm
Electron configuration[Ar] 4s2
Electrons per shell2, 8, 8, 2
Number of protons20
Number of neutrons20

Other languages
SpanishCalcio
PortugueseCálcio
FrenchCalcium
GermanCalcium
ItalianCalcio
RussianКальций
PolishWapń
Chinese
Arabicكالسيوم
TurkishKalsiyum
DutchCalcium


Periodic table of the elements
PotassiumCalciumScandium