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

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.

In potassium, the 19th electron enter into 4s subshells instead of 3d subshells.

The elements in which electron enters to 3d orbitals

Why does an electron enter 4s orbital but not 3d after completely filling 3p orbital?

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

The angular momentum of an electron in 4s orbital, 3p orbitals and 4th orbit are

Statement 1. 4s orbital has lower energy than 3d orbital. Statement 2. s-orbital is spherically symmetrical and remains closer to the nucleus and has lower energy than d-orbital.

The electron enters into 4 s orbital after filling 3 p orbital but not into 3d . Explain the reason .