Question

Which is most likely true about electronegativity?
It tends to be the same across a period.
It tends to be the same down a group.
It tends to increase across a period.
It tends to increase down a group.

Answer 1

"It tends to increase across a period."

Reason: Across a period nuclear charge increases while electrons are added to the same shell, so atoms hold bonding electrons more tightly. Electronegativity generally decreases down a group because increased atomic radius and shielding reduce attraction for bonding electrons.