The number of -electrons retained in (At. no. of Fe = 26) ion is:

Question

The number of -electrons retained in  (At. no. of Fe = 26) ion is:

Canvas Classes · Accepted Answer

Fe (Z=26):

Forming : Remove 2 electrons from the outermost shell (4s²) first:

d-electrons retained = 6

Note: Electrons are removed from 4s before 3d when forming cations (even though 4s fills before 3d in neutral atoms, it has higher energy in cations).

Answer: Option (3) — 6

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