Which of the given elements A,B,C,D and E with atomic numbers 2,3,7,10 and 30 belong to the same period?

Which of the given elements A,B,C,D and E with atomic numbers 2,3,7,10 and 30 belong to the same period?

Q. Which of the given elements A,B,C,D and E with atomic numbers 2,3,7,10 and 30 belong to the same period?

A.            A,B,C

B.            B,C,D

C.            A,D,E

D.            B,D,E

Answer: B,C,D

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