Question

what is the trend in electronegativity? increases - down a group increases - across a period decreases - down a group decreases - across a period increases - down a group decreases - across a period decreases - down a group increases - across a period

Explanation:

Electronegativity is the ability of an atom to attract electrons. As you move across a period (left - to - right) on the periodic table, the number of protons increases and the atomic radius decreases, resulting in a stronger pull on electrons, so electronegativity increases. As you move down a group, the atomic radius increases and the outermost electrons are further from the nucleus, so electronegativity decreases.

Answer:

Decreases - down a group, Increases - across a period