Which of the given elements A, B, C, D and E with atomic number 2… - Vidyadip

MCQ

Which of the given elements $\ce{A, B, C, D}$ and $E$ with atomic number $2, 3, 7, 10$ and $30$ respectively belong to the same period?

A
$\ce{A, B, C}.$
✓
$\ce{B, C, D}.$
C
$\ce{A, D, E}.$
D
$\ce{B, D, E}.$

✓

Answer

Correct option: B.

$\ce{B, C, D}.$

The elements $\ce{B(Z = 3), C(Z = 7)}$ and $\ce{D(Z = 10)}$ belong to the same period. It is second period.

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