Final answer:
Fluorine has the highest electronegativity of any element in the periodic table and attracts electron density in a covalent bond.
Step-by-step explanation:
Fluorine has the highest electronegativity of any element in the periodic table. Electronegativity is a measure of the tendency of an element to attract electrons towards itself. Fluorine has an electronegativity value of 4.0 on the Pauling scale, which is the highest value among all the elements.
When fluorine forms a covalent bond with another atom, it attracts electron density towards itself due to its high electronegativity. This means that the electron density in the covalent bond is localized around the fluorine atom.