Question

Check the correct box to describe the periodic trends in electronegativity.

Electronegativity across a period:

decreases.

increases.
Electronegativity down a group:

decreases.

increases.

Answer 1

Electronegativity across a period: increases. (check)

Electronegativity down a group: decreases. (check)

Brief reason: Across a period effective nuclear charge increases (atoms pull shared electrons more strongly). Down a group atomic radius and shielding increase, so attraction for shared electrons decreases.