5) A 250.0-mL aqueous solution contains 45.1 mg of a pesticide Express the pesticide's concentration in weight percent, parts per million, and parts per billion.

They are all solids.

☆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

Sorry i dont understand the question can you rephase it?