Question

(1) In potassium, the 19th electron enters into 4S subshell instead of 3d subshell.​

Answer 1

Answer:

yes its true

Explanation:

Because energy of 3d subshell is greatet than 4s subshell according to n+l rule

Answer 2

In potassium, the 19th electron enters into 4s subshell instead of 3d subshell in accordance with the Afbau Principle.

- The energy of 4s subshell is lower than the 3d subshell.

- According to the Afbau principle, the subshell with lower energy must be filled first.

- Hence, the 19th electron of potassium enters into 4s subshell instead of 3d subshell.​