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In the NCERT Chemistry textbook for Class XI (see pp 61), the reason for the stability of half-filled & fully-filled subshells in an atom is explained as being related to the Exchange Energy (based on Hund's Rule of Maximum Multiplicity). Also it is mentioned that the stability is due to smaller coulombic repulsion energy between electrons. Doubts:- 1. What actually is the phenomenon of Quantum Exchange? 2. Wikipedia says that the reason of "stability is due to smaller coulombic repulsion energy between electrons", based on Hund's Rule of Maximum Multiplicity, is factually incorrect. Is Wikipedia's statement correct or NCERT's explanation correct? You may refer here for :- 1.NCERT Textbook (see pp 61) - http://www.ncert.nic.in/NCERTS/textbook/textbook.htm?kech1=2-7 2. Wikipedia's article on Hund's Rule of Maximum Multiplicity (see line 2 in Details section) - http://en.wikipedia.org/wiki/Hund's_rule_of_maximum_multiplicity
I think it better to go with NCERT because you will get marks while writing the answer of NCERT and not wikipedia.These are all postulates ,so donot go by this .In higher studies in research field you will let to know about this
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