what is the electronic configuration of sodium and radium and what are alkanine earth metal

Electronic  configuration of sodium is [Ne] 3s^1

Electron configuration of radium is [Rn] 7s ^2 

ALKALINE EARTH METALS:

any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table. They are reactive, electropositive, divalent metals, and form basic oxides which react with water to form comparatively insoluble hydroxides.