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Which of the following electronic configurations corresponds to Eu2+?

1. [Xe]4f6 6s2 – 6 unpaired e−
2. [Xe]4f7 6s2 – 7 unpaired e−
3. [Xe]4f6 6s0 – 0 unpaired e−
4. [Xe]4f7 5d1 6s2 – 2 unpaired e−

Correct answer: [Xe]4f6 6s2 – 6 unpaired e−

Solution

Europium (Eu) has an atomic number of 63, and its neutral configuration is [Xe]4f7 6s2. For Eu2+, two electrons are removed, typically from the 6s orbital, resulting in [Xe]4f6 6s0. This configuration has 6 unpaired electrons in the 4f subshell.

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