Question

Which one of the following represents the configuration of the most electropositive element

• A. $\left[Xe\right]6s^1|$
• B. $\left[He\right]2s^1|$
• C. $\left[He\right]2s^2|$
• D. $\left[Xe\right]6s^2|$

Answer 1

The correct option is A $\left[Xe\right]6s^1|$

Electropositive nature increases down the group and decreases across the period.
$\left[He\right]2s^1|\to Li$ first group element
$\left[Xe\right]6s^1|\to Cs$ first group element
$\left[He\right]2s^2|\to Be$ second group element
$\left[Xe\right]6s^2|\to Ba$ second group element