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प्रश्न
Why first ionization enthalpy of chromium is lower than that of zinc?
Why first ionisation enthalpy of Cr is lower than that of Zn?
Why is the first ionisation enthalpy of chromium less than that of zinc?
(Atomic Number of Cr = 24 and Zn = 30)
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उत्तर
- In Cr is [Ar] (3d5 4s1), removing the 4s1 electron is easier because it leaves a highly stable, half-filled d5 subshell.
- In Zn is [Ar] (3d5 4s2), the electron must be removed from a completely filled 4s2 orbital, which is inherently more stable and harder to disrupt.
- Zn has a higher atomic number (Z = 30) than Cr (Z = 24), meaning its nucleus exerts a stronger pull on the valence electrons.
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