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Hydrogen,Berelium,Sodium,Magnesium(12)...i)Write pair elements having similar properties. ii)Group number iii)Name of one element in each group.



The Brainliest Answer!
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
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