The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
Solution
Eu $\to$ [Xe]4f<sup>7</sup>6s<sup>2</sup><br><br>Eu<sup>2+</sup> $\to$ [Xe]4f<sup>7</sup>
About this question
Subject: Chemistry · Chapter: d and f Block Elements · Topic: Properties of Transition Metals
This question is part of PrepWiser's free JEE Main question bank. 155 more solved questions on d and f Block Elements are available — start with the harder ones if your accuracy is >70%.