Question

Which is most likely true about electronegativity?

Answer 1

It tends to increase across a period.
This is visible in the first period, where Nitrogen is less electronegative than Oxygen which is less electronegative than Fluorine.

Answer 2

Answer:

It tends to increase across a period.

Explanation:

Electronegativity is the tendency of an atom in a bond pair to attract the shared pair of electron towards itself.

Low ionization energies as well as low electron affinities mean the atom has low effective nuclear charge, which results in the less attraction of the valence electrons by the atom and thus, low electronegativity.

Thus, across the period, electronegativity increases and down the group, it decreases.