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Why does cerium readily form a +4 state?
ACe4+ has noble gas configuration
BCe4+ has a full 4f set
CCe4+ keeps one 4f electron
DCe4+ has half-filled 4f
Answer & Solution
Correct answer: A. Ce4+ has noble gas configuration
Losing four electrons leaves Ce4+ with an empty 4f set and a noble gas configuration.
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