The measure of the distance an object travels in a certain length of time is the object's a) direction. b) energy. c) position. d) speed.

☆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

The state or quality of being humid.a quantity representing the amount of water vapor in the atmosphere or a gas.