Example Of Hund S Rule
Consider the electron configuration for carbon atoms.
Example of hund s rule. The two 2s electrons will occupy the same orbital whereas the two 2p electrons will be in different orbital and aligned the same direction in accordance with hund s rule. For example for boron through neon the electron filling order of the 2p orbitals follows hund s rule.
In the configuration p 2 we expect the order 3 p 1 d 1 s. The superscript 3 is the value of the multiplicity 2s 1 3.
Hund s rule states that each orbital in a subshell is only obtained before any orbital is double involved. The basis for this rule is essentially that if the electrons are orbiting in the same direction and so have a large total angular momentum they meet less often than when they orbit in opposite directions.
All of the electrons in singly occupied orbitals have a similar spin to maximize total spin. Hund s first rule now states that the ground state term is 3 p which has s 1.
Hund s rule 2 for a given multiplicity the term with the largest value of l lies lowest in energy. According to the first rule electrons.
Hunds rule of maximum multiplicity rule states that for a given electron configuration the term with maximum multiplicity falls lowest in energy. Every orbital in a sublevel is singly occupied before any orbital is doubly occupied.
1s 2 2s 2 2p 2. All of the electrons in singly occupied orbitals have the same spin.
Consider also the electron configuration of oxygen. The diagram shows the state of this term with m l 1 and m s 1.
