Which two trends increase when one moves across a period from left to right?

atomic size and size of cations

ionization energy and atomic size

ionization energy and electronegativity

electronegativity and atomic size

Ionization energy and electronegativity increases when we move across a period from left to right.

Atomic size decreases from left to right so all other options are incorrect.

The reason behind the increase of ionization energy and electronegativity from left to right is this:

Ionization energy increases because as the atomic size decreases, the outer electrons get closer to the nucleus and the strong attration will developed and thus increases ionization energy.

when the number of protons in the nucleus increases, as they are posotively charged they attract the electrons that are negatively charged and thus it increases electronegativity of an atom.