What is eletroegativity?

Answer 1

Electronegativity : is said to be the tendency of an atom that attract a pair of electrons that is shared with other atoms.

Answer 2

Electronegativity is a measure of an atom's ability to attract and hold onto electrons. It increases across periods on the Periodic Table and decreases down groups. Elements with high electronegativity tend to attract electrons strongly in chemical bonds, while those with low electronegativity tend to lose electrons easily.