Which of the following increases towards the top right of the periodic table?

Electronegativity and ionization energy both increase towards the top right of the periodic table due to the effective nuclear charge and the size of the atom.

As you move up a group in the periodic table, the atomic radius decreases because the electrons are located in energy levels that are closer to the nucleus. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons. As a result, the ability of an atom to attract electrons when forming bonds (electronegativity) increases. Fluorine, located at the top right of the periodic table, is the most electronegative element because it has a high tendency to attract electrons due to its small size and greater nuclear charge.

Ionization energy, which is the energy required to remove an electron from an atom, also increases in this region. Again, this is because smaller atoms with a higher effective nuclear charge hold their electrons more tightly, requiring more energy to overcome this attraction and remove an electron.

Thus, both electronegativity and ionization energy trend upwards towards the top right corner of the periodic table, making that choice the correct answer.