The number of valence electrons present in the metal among $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and Ni…

The number of valence electrons present in the metal among $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and Ni which has the lowest enthalpy of atomisation is
  1. $8$
  2. $9$
  3. $6$
  4. $10$

Solution

Out of $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and $\mathrm{Ni}$
Chromium has lowest heat of atomisation.
$\mathrm{Cr}=[\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^1$
$\because$ Total six valence $\mathrm{e}^{-}$in $\mathrm{Cr}$.

Asked in: JEE Main 2025 (07 Apr Shift 1)

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