Which of the following statements about electronegativity are true? (Select all that apply)

Electronegativity is the tendency of an atom to attract shared electrons in a bond, and it rises steadily from left to right across a period because the nucleus pulls more strongly on the electrons. It falls down a group as the outer electrons are farther from the nucleus and shielded by inner shells, so the attraction weakens. Fluorine has the highest electronegativity of all elements, making it the most eager to gain electrons. Atoms with a single valence electron, like lithium, have a low electronegativity because they easily lose that electron. Thus, the true statements are those that describe these trends and the special case of fluorine.