Question

Highest amount of energy will be required to remove an electron from:
(for the same value of n)

• A. $s-\text{subshell}$
• B. $p-\text{subshell}$
• C. $d-\text{subshell}$
• D. $f-\text{subshell}$

Answer 1

The correct option is A $s-\text{subshell}$

For the same value of principal quantum number (n), the degree of closeness to the nucleus for the subshells are $s>p>d>f$. $s$-subshell is the closest among the four. That means electrons present in the $s$ subshell are strongly bound to the nucleus. Hence, it is very difficult to remove an electron from the $s$-subshell.