88 Ra 226

Radium

ALKALINE EARTH METAL

Phase: Solid

Discovered: Pierre Curie

Block: S

Summary

Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).

Appearance: silvery white metallic

Source: Wikipedia

Physical Properties

Atomic Mass 226 u

Density 5.5 g/cm³

Melting Point 1233 K

Boiling Point 2010 K

Molar Heat N/A

Electron Affinity 9.6485 kJ/mol

Ionization Energies

1^st: 509.3 kJ/mol

2^nd: 979 kJ/mol