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2016-03-12T21:41:38+05:30
Hydrogen - 1
bereilium - 4      {atomic number]
sodium -11
magnesium -12 
they all are metallic in nature ...
hydrogen and sodium is in 1st group .
berilium and magnesium is in 2nd group
in 1st group- potassium ,2nd   group - calcium
2 5 2