Q. 403.8( 4 Votes )
Five elements A, A. A, B, C
B. B, C, D
C. A, D, E
D. B, D, E
Answer :
Five elements A,B,C,D and E have atomic numbers of 2,3,7 10 and 18 respectively.The elements which belong to the same group of the periodic table is B,C,D
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