Discussion
Which of the following is correct about the stability of half filled and completely filled subshells?
(i) Relatively small shielding
(ii) Larger coulombic repulsion energy
(iii) Smaller exchange energy
(iv) Smaller coulombic repulsion energy
(v) Larger exchange energy
Answer: C
The correct statements are (i), (iv) and (v).
Half filled and completely filled subshells are extra stable because their electron distribution is symmetrical, giving relatively small shielding and smaller coulombic repulsion energy, and because many electrons of parallel spin can exchange places, giving a larger exchange energy.
Statements (ii) and (iii) are the opposites of (iv) and (v), so any option containing them is wrong. That is why chromium is 3d54s1 and copper 3d104s1.
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