Question

The period of element having three shells with three electrons in valence shell is:

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is B 3

Electronic configuration of the element with 3 shells and 3 valence electrons is 2,8,3.

So, they have 3rd orbit as valence shell and they have 3 electrons in the valence shell, so they belong to 3rd group.

Hence, the correct option is $\text{B}$