Question

state and expian aufbau principle​

Answer 1

Answer:

According to the Aufbau principle, electrons first occupy those orbitals whose energy is the lowest.

Explanation:

This implies that the electrons enter the orbitals having higher energies only when orbitals with lower energies have been completely filled.

The order in which the energy of orbitals increases can be determined with the help of the (n+l) rule, where the sum of the principal and azimuthal quantum numbers determines the energy level of the orbital.

Lower (n+l) values correspond to lower orbital energies. If two orbitals share equal (n+l) values, the orbital with the lower n value is said to have lower energy associated with it.

The order in which the orbitals are filled with electrons is: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and so on.

Answer 2

Answer:

The Aufbau principle states that electrons are filled into atomic orbitals in the increasing order of orbital energy level. According to the Aufbau principle, the available atomic orbitals with the lowest energy levels are occupied before those with higher energy levels.

Eg :- Carbon (Z=6) = 1s2 2s2 2p2