Answer
Hund's rule states that electrons occupy every orbital in a subshell singly with the same spin number before any of the orbitals have two electrons. There are two electrons in the 2p subshell of a Carbon atom. Each occupy a p orbital with the same spin. In oxygen, there are four electrons in the 2p subshell. Three occupy the three p shells with parallel spins and the fourth is paired with one of the three electrons.
Work Step by Step
Hund's rule states that electrons occupy every orbital in a subshell singly with the same spin number before any of the orbitals have two electrons. There are two electrons in the 2p subshell of a Carbon atom. Each occupy a p orbital with the same spin. In oxygen, there are four electrons in the 2p subshell. Three occupy the three p shells with parallel spins and the fourth is paired with one of the three electrons.
