Which of the given elements A, B, C, D
Question:

Which of the given elements A, B, C, D and E with atomic numbers 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.

Solution:

(b). The elements B (Z = 3), C (Z = 7) and D(Z = 10) belong to the same period. It is second period.

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