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Although $+3$ oxidation state is the chacteristic oxidation state of lanthanoids but cerium shows $+4$ oxidation state also. Why?
Chemistryd and f Block Elements
Solution:
1281 Upvotes Verified Answer
Ce acquires stable $4 \mathrm{f}^0$ electronic configuration after losing one more electron from $\mathrm{Ce}^{3+}$. So, Ce shows $+4$ oxidation state al so along with $+3$ oxidation state.

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