Which of the given elements A, B, C, D and E with atomic numbers 2, 3, – InterviewSolution

1.

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

Answer»

The answer is (b) B, C, D

Element with atomic number belong to first period and element B, C and D belongs to second period.

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