Assertion : The 19th electron in potassium atom enters 4s-orbital and not 3d orbital.
Reason : The energies of the orbitals can be compared with the help of (n+l) rules.

Statement 1. In potassium atom, 19th electron enters 4s orbital and not 3d orbital. Statement 2. Orbital energies are compared by (n+l) rule.

STATEMENT-1 : The 19^(th) electron in potassium atom enters into 4s-orbital than in 3d-orbital. and STATEMENT-2 : (n+1l) rule is followed for determining the orbital of lowest energy state.

STATEMENT-1 : The 19^(th) electron in potassium atom enters into 4s-orbital than in 3d-orbital. and STATEMENT-2 : (n+1l) rule is followed for determining the orbital of lowest energy state.

Assertion : For the outermost electron in Na atom, the orbital angular momentum is zero. Reason : For 3s electron , l = 0 and orbital angular momentum is zero.

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital