Technical data for Calcium

Overview
NameCalcium
SymbolCa
Atomic Number20
Atomic Weight40.078
Density1.55 g/cm3
Melting Point842 °C
Boiling Point1484 °C

Thermal properties
PhaseSolid
Melting Point842 °C
Boiling Point1484 °C
Absolute Melting Point1115 K
Absolute Boiling Point1757 K
Heat of Fusion8.54 kJ/mol
Heat of Vaporization155 kJ/mol
Heat of Combustion-990 J/(kg K)
Specific Heat631 J/(kg K)[note]
Thermal Conductivity200 W/(m K)
Thermal Expansion0.0000223 K-1

Bulk physical properties
Density1.55 g/cm3
Density (Liquid)1.378 g/cm3
Molar Volume0.000025857
Brinell Hardness167 MPa
Mohs Hardness1.75 MPa
Vickers HardnessN/A
Bulk Modulus17 GPa
Shear Modulus7.4 GPa
Young Modulus20 GPa
Poisson Ratio0.31
Refractive IndexN/A
Speed of Sound3810 m/s
Thermal Conductivity200 W/(m K)
Thermal Expansion0.0000223 K-1

Reactivity
Valence2
Electronegativity1
ElectronAffinity2.37 kJ/mol
Ionization Energies
589.8, 1145.4, 4912.4, 6491, 8153, 10496, 12270, 14206, 18191, 20385, 57110 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group2
Period4
Electron Configuration[Ar]4s2
ColorSilver
Discovery
1808 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-70-2

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.9×107 S/m
Resistivity3.4×10-8 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.38×10-8
Molar Magnetic Susceptibility5.531×10-10
Volume Magnetic Susceptibility0.00002139

Abundances
% in Universe0.007%
% in Sun0.007%
% in Meteorites1.1%
% in Earth's Crust5%
% in Oceans0.00042%
% in Humans1.4%

Atomic dimensions and structure
Atomic Radius194 pm
Covalent Radius174 pm
Van der Waals RadiusN/A
Crystal StructureFace Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
558.84, 558.84, 558.84 pm
Space Group NameFm_ 3m
Space Group Number225

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
40Ca, 42Ca, 43Ca, 44Ca, 46Ca
Isotopic Abundances
40Ca96.941%
42Ca0.647%
43Ca0.135%
44Ca2.086%
46Ca0.004%
48Ca0.187%

Notes on the properties of Calcium:
Specific Heat: Value given for solid phase.