Which type of air pollution is NOT caused by the burning of fossil fuels? a. carbon monoxide
b. acid precipitation
c. particulate matter
d. CFCs

Ithink it’s 3 as the answer.

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts