Matter {Ans: Anything that has mass and takes up space}Gas {Ans: A state of matter with no definite shape or volume}mole {Ans: the SI base unit used to measure the amount of a substance}Neutron {Ans: A subatomic particle that has no charge and that is found in the nucleus of an atom}Solid {Ans: A form of matter that has a definite shape and volume; strong ionic bonds}polyatomic ion {Ans: a tightly bound group of atoms that behaves as a unit and has a positive or negative charge}