| A | B |
|---|
| matter | anything that has mass and takes up space |
| element | a substance that can't be separated or broken down into simpler substances by chemical means |
| atom | the smallest unit of an element that maintains the chemical properties of that element |
| proton | a subatomic particle that has a positive charge; in nucleus of atom; number of protons is the atomic number |
| electron | a subatomic particle that has a negative charge |
| neutron | a subatomic particle that has no charge and is located in the nucleus of an atom |
| isotope | an atom that has the same number of protons as the other atoms of the same element but different number of neutrons |
| compound | a substance made up of atoms of 2 or more different elements joined by chemical bonds |
| molecule | a group of atoms held together by chemical forces; smallest unit of matter that can exist by itself & retain all of substance's chemical properties |
| ion | an atom or molecule that has gained or lost 1 or more electrons; has - or + charge |
| ionic bond | the attractive force between oppositely charged ions; form when electrons are transferred |
| covalent bond | a bond formed when atoms share one or more pairs of electrons |
| mixture | a combination of two or more substances that are not chemically combined |
| solution | a homogeneous mixture of two or more substances that are uniformly dispersed throughout the mixture |
