Question

Why is the electronegativity of bromine is less negative than that of chlorine??​

Answer 1

Answer:

On moving from chlorine to bromine to iodine, the electron affinity decreases (becomes less negative). This is because the increase in atomic size decrease the effective nuclear charge. Hence, the additional electron feels less attraction by the large atom.

Answer 2

Electronegativity is the tendency for an atom to attract electrons. As such, it has a lower tendency to attract electrons , and thus has a lower electronegativity.