What does electronegativity indicate in a chemical element?

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It specifically indicates how strongly an atom can pull electrons toward itself when bonded to another element. In the context of chemical bonding, the higher the electronegativity of an element, the greater its ability to attract electrons from other atoms. This concept is essential in determining how electrons are shared in covalent bonds and can also help predict the nature of bonds (ionic or covalent) between different elements based on their electronegativity values.

The other options do not define electronegativity accurately: the ability to conduct electricity relates to factors like metallic character and electron mobility in materials; the mass of the element pertains to atomic weight, which does not involve electron attraction; and reactivity with other elements is influenced by a combination of factors, including electronegativity but is not synonymous with it.