question_answer

Hunds rule states that:

A)  matter and radiation have a dual nature

B)  in an atom no two electrons can have the same set of four quantum numbers

C)   the position and velocity of an electron cannot be exactly measured at one and same time

D)  in orbitals of equivalent energy, electron spins remain unpaired until each orbital holds at least one electron

Correct Answer: D

Solution :

                 Hunds rule of maximum multiplicity : According to Hunds rule pairing of electrons does not takes place in an empty orbital or pairing of electrons takes place only when each orbital contains one electron. Example \[{{\,}_{8}}O=1{{s}^{2}},2{{s}^{2}},2{{p}^{4}}\]