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Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are

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A, B, C

B, C, D

A, D, E

B, D, E

answer is B.

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Detailed Solution

$B - 3 - Li - 1 s^{2} \begin{matrix} 2 s^{1} \end{matrix}$

$C - 7 - N - 1 s^{2} \begin{matrix} 2 s^{2} 2 p^{3} \end{matrix}$

$D - 10 - Ne - 1 s^{2} \begin{matrix} 2 s^{2} 2 p^{6} \end{matrix}$

Outermost orbit is same i.e 2^nd orbit.

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