Which among the following elements has the lowest electronegativity?

Francium

The correct answer is option 2. Francium.

Among the options provided, the element with the lowest electronegativity is Francium.

Francium (Fr) has the lowest electronegativity among the elements listed. It belongs to Group 1 (alkali metals) of the periodic table, and alkali metals typically have very low electronegativities compared to other elements. Francium's low electronegativity reflects its tendency to readily lose its valence electron, making it highly reactive.