Question

On the basis of electronic configuration of 5X9

, the group number and period of the element ‘X’ is:

(a) Group 15 period 2 (b) Group 13 period 2 (c) Group 9 period 5 (d) Group 13 period 5​

Answer 1

Answer:

XY2

EXPLANATION :-

because ● atomic no 11 electronic conf 2 ,8,1 ●atomic no 8 electronic cone 2 ,6 now for forming compound

because ● atomic no 11 electronic conf 2 ,8,1 ●atomic no 8 electronic conf 2 ,6 now for forming compound outermost electron of x and y should be cross multiplied

i.e.: x×x1Y2

i.e: x×x1Y2XY2