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Chromium has the electronic configuration 4s1 3d5rather than4s2, 3d4 because:
(1) 4s and 3d have the same energy
(2) 4s has a higher energy than 3d
(3)4s1 is more stable than 4s1
(4)4s1 3d5 half-filled is more stable than 4s2 3d4
Ans: 4s1 3d5 half-filled is more stable than 4s2 3d4
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# objective for the lesson plan
1. why YbS and YbI2 are semiconducting solids but LaS and LaI2 show metallic character. 2. Why is aqueous solution of Eu2+ thermodynamically less susceptible to oxidation than any
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