find A,B,c,d elements belong to which group if their atomic numbers are 12,21,35 and 44
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12 Mg group iiA , 21 Sc group iiiB , 35 Br group ViiA , 44 Ru group ViiiB
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A- 12: 2,8,2
A belongs to 2nd group and 3rd periods
B- 21 : 2,8,8,3
B belongs of group 13 and period number 4
C- 35 : 2,8,18,7
C belongs to group no. 17& period number 4
D - 44: 2,8,18,8,8
D belongs to group no. 8 and period number 5
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