Question

The correct electronic configuration for $E{u}^{2+}$ is

• A. $\left[Xe\right]4f^6$
• B. $\left[Xe\right]4f^7$
• C. $\left[Xe\right]4f^5$
• D. $\left[Xe\right]4f^{7}5d^1$

Answer 1

The correct option is B $\left[Xe\right]4f^7$

The atomic number of $Eu$ is $63$. So, the electronic configuration of $Eu$ is $\left[Xe\right]4f^{7}6s^2$. For $E{u}^{2+}$ two electrons are removed from $6s^2$. So, the electronic configuration of $E{u}^{2+}$ is $\left[Xe\right]4f^7$.