1.

Filling of electrons in the orbitals on a ground state atom is governed by three rules. (a) Which are the three rules? (b) State any one of them.

Answer»

(a) (1) Aufbau principle 

(2) Pauli’s exclusion principle 

(3) Hund’s rule of maximum multiplicity 

(b) Hund’s rule of maximum multiplicity – electron pairing in orbitals of same energy will not take place until each degenerate orbital of a given subshell is singly occupied.



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