What is the electronic configuration of chromium? Why is it different from other elements?

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Solution

The electronic configuration of chromium is $C r = [A r] 4 s^{1} 3 d^{5}$ .
This happens because of the following:
a) Completely filled sublevels are more stable than partially filled sublevels.
b) A sub-level, which is exactly half filled is more stable than a partially filled sublevel.
c) Electrons will remain in the lowest energy state as this is the most stable state.

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_{24} C r - [A r] 3 d^{5} 4 s^{1}

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