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  • 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

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

Answers (1)

Ans(b)
Sol.
First period – 2 elements – Atomic number 1-2
Second period – 8 elements – Atomic number 3-10
Third period – 8 elements – Atomic number 11-18
Fourth period – 16 elements – Atomic number 19-36
So, 2nd Period has elements with atomic number 3 to 10

Hence option (b) is correct.

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infoexpert27

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