Question

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

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

Answer 1

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

From the given electronic configurations, the elements can be identified as
a) Li
b) Cs
c) Be
d) Ra

As we move down the group and as we move from right to left, electropositive character increases. Hence Cs is the most electropositive element among the given elements.