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?

1. A, B, C
2. B, C, D
3. A, D, E
4. B, D, E

Correct answer: (b) B, C, D

Explanation: The 2^nd period contains elements with atomic numbers 3(Li), 7(N), 10(Ne). Since the second period has elements having atomic numbers 3 to 10.

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Updated on: 13-Mar-2023

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