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Which of the following configuration is correct for iron? (a) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^3

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Which of the following configuration is correct for iron?

(a) 1s2 2s2 2p6 3s2 3p6 4s2 3d3 

(b) 1s2 2s2 2p6 3s2 3p6 4s2 3d5 

(c) 1s2 2s2 2p6 3s2 3p6 3d5 

(d) 1s2 2s2 2p6 3s2 3p6 4s2 3d6

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Correct option (d) 1s2 2s2 2p6 3s2 3p6 4s2 3d6

Explanation :

26Fe → 1s2 2s2 2p6 3s2 3p6 4s2 3d6 

According to 'n + l' rule electron first enters to '4s' and then to 3d subshell.

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