Question

Assertion : The 19^th electron in potassium atom enters into the 4s-orbital and not into the 3d-orbital.

Answer 1

(n + l) rule is followed for determining the orbitals of the lowest energy state

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false