Question

What is hund's rule?​

Answer 1

Answer:

Hund's rule of maximum multiplicity is a rule based on observation of atomic spectra, which is used to predict the ground state of an atom or molecule with one or more open electronic shells.

Answer 2

Explanation:

Aufbau principle tells us that the lowest energy orbitals get filled by electrons first. After the lower energy orbitals are filled, the electrons move on to higher energy orbitals. The problem with this rule is that it does not tell about the three 2p orbitals and the order that they will be filled in.

According to Hund’s rule:

Before the double occupation of any orbital, every orbital in the sub level is singly occupied.

For the maximization of total spin, all electrons in a single occupancy orbital have the same spin.

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