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Use electron configurations to account for the stability of the lanthanide ions Ce⁴⁺ and Eu²⁺.
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Use electron configurations to account for the stability of the lanthanide ions Ce⁴⁺ and Eu²⁺.

User Ji Yalin
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Answer:

Step-by-step explanation:

The Ce metal has electronic configuration as follows

[Xe] 4f¹5d¹6s²

After losing 4 electrons , it gains noble gas configuration ,. So Ce ⁺⁴ is stable.

Eu has electronic configuration as follows

[ Xe ] 4 f ⁷6s²

[ Xe ] 4 f ⁷

Its outermost orbit contains 2 electrons so Eu²⁺ is stable. Its +3 oxidation state is also stable.

Ce⁺²

User Warif Akhand Rishi
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