Answers

2016-03-15T14:01:12+05:30
On second group It has the elements Be , Mg, Ca,...Ra
Thus the first two are Be and Mg
They have atomic number as 4 and 12 respectively...
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2016-03-15T15:14:05+05:30
First 2 elements of Group 2 are beryllium and magnesium AT.NO of Be=4 AT.NO of Mg=12
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