Question

explain the principles which describes the arrangement of electron in degenerate orbit​

Answer 1

The aufbau principle,

from the German Aufbauprinzip (building-up principle), also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels..

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Answer 2

The principles which describes the arrangement of electron in degenerate orbit​: Aufbau principle and Hund's rule of maximum multiplicity .

Explanation:

Degenerate orbitals

They are electrons orbitals with same energy .

The rules that are followed are for arrangement of electron in degenerate orbit :

Aufbau principle

It states that in ground state of atom, the orbitals are filled in order of their increasing energies. That is electrons first occupy the lower energy orbital then higher energy orbitals are filled.

The orbitals are filled in order:

 1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,6s,4f,5d,6p,7s,5f,6d,7p…

To know the energy of orbital with lower energy the n+l rule is followed:

According to it:

• The lower the value of n+l for an orbital, the lower is its energy and is filled first.

For example: Out of 2s and 2p, 2s is filled first as n+l for 2s, is 2+0=2 and for 2p it is 2+1=3. Therefore, 2s is filled first.

• If two orbitals have same value of n+l, than the orbital with lower value of n is filled first.

For example: Out of 3p and 4s, n+l for both is 4 . Therefore, 3p is filled first as it possess lesser value of n.

2. Hund’s rule of maximum multiplicity:

According to it, electron pairing in degenerate orbital will not take place until and unless, each orbital is singly filled.