What is electronegativity?
An atom's ability to attract other electrons and form a chemical bond
A type of electricity only found in some atoms
The total number of electrons in an atom
so
A property of electrons that give them a negative charge

An atom's ability to attract other electrons and form a chemical bond

Explanation:

The electronegativity of an atom tells of its power to attract electrons. Electronegativity values of elements ranges from 0 to 4.0, a high value means higher ability to attract electrons while a lower value means lower ability to attract electrons. Also, a wider difference in electronegativity between two atoms gives an ionic bond unlike a covalent bond with narrow difference.

Thus, nonmetals like chlorine higher electronegativities than metals like potassium.