CBSE Class 10 Science 2020 · Paper 31/2/1 · Question 12(a)
On the basis of electronic configuration of , 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
(b) Group 13 period 2
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