Question

find A,B,c,d elements belong to which group if their atomic numbers are 12,21,35 and 44​

Answer 1

12 Mg group iiA , 21 Sc group iiiB , 35 Br group ViiA , 44 Ru group ViiiB

Answer 2

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