The chemical symbol for Radium is Ra and its atomic number is 88.
We find it listed in the periodic table of elements in group 2 and 7 period and block s.
Radium belongs to the family of alkaline earth metals such as for example Barium, Beryllium, Calcium ...
This element is Radioactive.
Radium came from the word Radius.
Atomic number (Z) 88
Group, block group 2 (alkaline earth metals), s-block
Period: period 7
Element category: alkaline earth metal
Standard atomic weight (Ar) (226)
Electron configuration: [Rn] 7s2
per shell: 2, 8, 18, 32, 18, 8, 2
Physical properties
Phase: solid
Melting point: 973 K (700 °C, 1292 °F) (disputed)
Boiling point: 2010 K (1737 °C, 3159 °F)
Density near r.t.: 5.5 g/cm3
Heat of fusion 8.5 kJ/mol
Heat of vaporization: 113 kJ/mol
Atomic properties
Oxidation states: 2 (expected to have a strongly basic oxide)
Electronegativity: Pauling scale: 0.9
Ionization energies 1st: 509.3 kJ/mol
2nd: 979.0 kJ/mol
Covalent radius: 221±2 pm
Van der Waals radius: 283 pm
Crystal structure: body-centered cubic
Thermal conductivity: 18.6 W/(m•K)
Electrical resistivity: 1 µΩ•m (at 20 °C)
Magnetic ordering: nonmagnetic
CAS Number: 7440-14-4