Question

The electrons in the orbitals are filled in order of increasing energy.

• A. True
• B. False

Answer 1

The correct option is A True

Aufbau principle states that an electron occupies orbitals in order from lowest energy to highest.
The available vacant atomic orbitals with the lowest energy levels are filled before those with higher energy levels.

Ascending order of energies of various atomic orbitals is given by-
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p < 8s....