Question

The electronic configuration of four elements are:

$\left(i\right)\left[Xe\right]{6s}^1$ $\left(ii\right)\left[Xe\right]{4f}^{14},{5d}^1{6s}^2$

$\left(iii\right)\left[Ar\right]{4s}^2{4p}^3$ $\left(iv\right)\left[Ar\right]{3d}^7,{4s}^2$

Which one of the following statements about these elements is not correct?

• A. $\left(i\right)$ is a strong reducing agent.
• B. $\left(ii\right)$ is a $d$-block element.
• C. $\left(iii\right)$ has high electron affinity.
• D. $\left(iv\right)$ shows variable oxidation states.

Answer 1

The correct option is C $\left(iii\right)$ has high electron affinity.

$\left[Xe\right]{4f}^{14},{5d}^1{6s}^2$ is a noble group element in a different oxidation state.