Which substance takes the shape of and fills the volume of any container into which it is placed?

Gases take the shape and fill the volume of any container you put them in. Liquids take the shape at the bottom but they don't fill the volume of the jar.

☆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