Question

The element $X$ with electronic configuration 2, 8, 8, 2 belongs to :

• A. $2^{nd}Period$
• B. $3^{rd}Period$
• C. $4^{th}Period$
• D. $5^{th}period$

Answer 1

Answer: (C)

$4^{th}Period$

The element with electronic configuration $2,8,8,2$ is calcium.

Calcium belongs to the $2^{nd}$ group and $4^{th}$ period in modern periodic table.