CHXII08:THE D- & F-BLOCK ELEMENTS
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The inner transition elements are the elements in which the added electrons go to
1 (n-1)d-orbitals
2 \({\rm{(n - 2)}}\)f-orbitals
3 (n-1)d-orbitals and (n-2)f-orbitals
4 (n-1)d-orbitals and ns orbitals
Explanation:
Elements in which differentiating electron enters into \(\mathrm{(n-2) f}\) orbitals are known as inner transition elements.