Question

part of the periodic table is given below where atomic no. of element are given in the parenthesis. B(4) ,O(8) ,mg (12) ,ca(20) ,Se(34),Sr(38) and Te(52)
(i) write to the electronic configuration of sulphur (s) and calcium(Sc)
(ii) write the no. of shell

Answer 1

(i) ec of sulphur = (2,8,6)
    ec of Calcium = (2,8,8,2)

(ii) No. of shells in Sulphur = 3
        and, in Calcium = 4

Answer 2

sulphur atomic number is 16
electronic configuration is 2,8,6

calcium -2,8,8,2