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2 February, 19:30

In Fe atom, which subshell experience the lowest effective nuclear charge and are hence the first removed upon ionization?

(A) 1s

(B) 3p

(C) 3d

(D) 4s

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  1. 2 February, 19:37
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    (D) 4s

    Explanation:

    The electronic configuration of a Fe atom is:

    1s² 2s² 2p⁶ 3s² 3p6 3d⁶ 4s².

    The subshell located farthest from the nucleus is 4s, that's why it experiences the lowest effective nuclear charge.

    This can be seen when looking at the electronic configurations of Fe⁺² and Fe⁺³:

    Fe⁺² ⇒ 1s² 2s² 2p⁶ 3s² 3p6 3d⁶.

    Fe⁺³ ⇒ 1s² 2s² 2p⁶ 3s² 3p6 3d⁵.
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