Discovered By: Humphry Davy
Discovery year: 1807

The following table showing some properties of Calcium(Ca):

Table Example
Atomic number 20
Group 2
Perioud 4
Block s
Electrons 20
Protons 20
Neutrons 20
Atomioc weight 40.078
Oxidation states +2
Ionic charge Ca^2+


Table Example
Electrons per shell K2 L8 M8 N2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
Atoic radius 194 pm
Covalent radius 176 pm
Boiling point 1484°C
melting point 842°C
Phase Solid
Fusion heat 8.54 kJ.mol^-1
specific heat 631 J.kg^-1.k^-1
Thermal expansion 2.23*10^-5 K^-1


Table Example
Vaporization heat 155 kJ.mol^-1
Color Silver
Brinell hardness 167 MPa
Bulk modulus 17 GPa
Density 1550 kg.m^-3
Liquid density 1378 kg.m^-3
Mohs hardness 1.75
Poisson ratio 0.31
Shear modulus 7.4 GPa
Sound speed 3810 m.s^-1


Table Example
Thermal conductivity 200W.m^-1.K^-1
Young's modulus 20 GPa
Electric type Conductor
Magnetic type Paramagnetic
Volume magnetic susceptibility 2.139*10^-5
Resistivity 3.4*10^-8 Ohm.m
Electronegativity 1
Valence 2
Radioactive No
Neutron cross section 0.43 barn