In examining electronegativity values, which atom will form the least polar bond with hydrogen?

The least polar bond with hydrogen occurs when both atoms involved in the bond have similar electronegativity values. Electronegativity, a measure of an atom's ability to attract and hold onto electrons in a chemical bond, is crucial in determining bond polarity.

In this case, hydrogen, when bonded with itself, has an electronegativity value of 2.1. Since both atoms are hydrogen, they share the bonding electrons equally, leading to a non-polar covalent bond. Bonds are considered polar when there is a significant difference in electronegativity between the two bonding atoms.

Fluorine, chlorine, and bromine all have higher electronegativity values than hydrogen, resulting in polar bonds when they bond with hydrogen. Specifically, fluorine (3.98), chlorine (3.16), and bromine (2.96) create more polar bonds due to their greater ability to attract shared electrons compared to hydrogen. Thus, among the atoms listed, hydrogen will form the least polar bond with itself, confirming that it's the correct answer to the question.