Discovered By: Pierre Curie, Marie Curie
Discovery year: 1898

The following table showing some properties of Radium(Ra):

Table Example
Atomic number 88
Symbol Ra
Group 2
Period 7
Block s
Electrons 88
Protons 88
Neutrons 138
Atomic weight (226)
Oxidation states +2


Table Example
Ionic charge Ra^2+
Ionic charge Ra^2+
Electrons per shell K2 L78 M18 N32 O18 P8 Q2
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 4f^14 5d^10 6p^6 7s^2
Covalent radius 221 pm
Boiling point 1737°C
Melting point 700°C
Phase Solid
Fusion heat 8 kJ.mol^-1
Vaporization heat 125 kJ.mol^-1


Table Example
Specific heat 92 J.kg^-1.K^-1
Color Silver
Density 5000 kg.m^-3
Molar volume 4.5*10^-5 m^3.mol^-1
Thermal conductivity 19 W.m^-1.K^-1
Electrical conductivity 1*10^6 S.m^-1
Electrical type Conductor
Resistivity 1*10^-6 Ohm.m
Electronegativity 0.9
Valence 2


Table Example
First ionization energy 509.3 kJ.mol^-1
Radioactive Yes
Half life 5*10^10 s
Lifetime 7.3*10^10 s
Neutron cross section 13 barn
Decay mode Alpha emission (α-decay)