Question

give me a example for hund's rule

Answer 1

Hund's rule states that: Every orbital in a sublevel is singly occupied before any orbital is doubly occupied. All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).

Answer 2

Hund's rules tells that every orbital in a sublevel is singly occupied before any orbital is doubly occupied. For example nitrogen atom

Consider. Correct electron configuration of nitrogen z = 7 atoms :1s2,2s2,2p2

The p orbitals are half-filled; there are three electrons and three p orbitals. This is because the three electrons in the 2p subshell will fill all the empty orbitals first before pairing with electrons in them.

Keep in mind that elemental nitrogen is found in nature typically as dinitrogen, N2, which requires molecular orbitals instead of atomic orbitals as demonstrated above.