Question

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

Answer 1

Answer: (D)

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 ${}_{8}O=1s^2,2s^2,2p^4$