Question

why chromium is 3d5 4s1 and not 4s1 3d5?

Answer 1

Answer:

1. according to afbau principle electrons are filled in the increasing order of energy of orbital
2. according to afbau principle electrons are filled in the increasing order of n+l value
3. if n + l value is same electrons are filled first in least n value orbital
4. so that in cr for 3d n+ l value is 3+2=5,for 4s n +l value is 4+0 =4 .so that cr valency electronic configuration 4s1 3d5 correct

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