Q6Multiple choice
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
- (a)A, B, C
- (b)B, C, D
- (c)A, D, E
- (d)B, D, E
Show answer
(b) B, C, D
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
(b) B, C, D