Discovered By: Humphry Davy
Discovery year: 1808

The following table showing some properties of Barium(Ba):

Table Example
Atomic number 56
Group 2
Period 6
Block s
Electrons 56
Protons 56
Neutrons 81
Atomic weight 137.327
Oxidation states +2
Ionic charge Ba^2+


Table Example
Electrons per shell K2 L8 M18 N18 O8 P2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2
Atomic radius 253 pm
Covalent radius 215 pm
Boiling point 1870°C
Melting point 727°C
Phase Solid
Fusion heat 8 kJ.mol^-1
Thermal expansion 2.06*10^-5 K^-1
Vaporization heat 140 kJ.mol^-1


Table Example
Color Silver
Bulk modulus 9.6 GPa
Density 3510 kg.m^-3
Liquid density 3338 kg.m^-3
Mohs hardness 1.25
Molar volume 3.912*10^-5 m^3.mol^-1
Shear modulus 4.9 GPa
Sound speed 1620 mn.s^-1
Young's modulus 13 GPa
Electrical conductivity 2.9*10^6 S.m^-1


Table Example
Electrical type Conductor
Magnetic type Paramagnetic
Resistivity 3.5*10^-7 Ohm.m
Electronegativity 0.89
Valence 2
Electron affinity 13.95 kJ.mol^-1
First ionization energy 502.9 kJ.mol^-1
Radioactive No
Neutron cross section 1.3 barn
Volume magnetic susceptibility 3.966*10^-5