Why does potassium have a lower electronegativity than Bromine?

No it shouldn't be the opposite and the experimental data (Here Ionization potential) can be neatly explained by theory.

The Bromine nucleus (Z=35) has more charge than potassium (Z=19)

The distance from the nucleus to the outermost orbit (The atomic radius) for Bromine (94 pm) is lesser than that of Potassium (239 pm). This may be treated as a consequence of point 1 and the fact that both elements belong to the same period.

Explanation:

Can I have brainleist?

Potassium has a lower EN than Bromine.

EN Trends:

Decreases down the group but increases across a period.

Potassium is to the left of the periodic table while bromine is on the right, and according to the trends, Bromine will be bigger because EN increases across a period. This allows the nucleus to attract the bonding electrons more strongly.

Hope it helps!

the answer is:  

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