| A | B |
|---|
| electron | negatively charged subatomic particle |
| electron cloud | space in an atom in which electrons are likely to be found |
| element | substance that cannot be separated into simpler substances by ordinary chemical means |
| energy level | most likely place within an electron cloud in which an electron can be found |
| gas | phase of matter that has neither a definite shape nor a definite volume |
| ion | electrically charged atom that has either lost or gained electrons |
| isotope | atom of a substance with the same number of protons but a different number of neutrons as another atom of the same substance |
| liquid | state of matter that has a definite volume but not a definite shape |
| atom | basic building block of matter |
| atomic number | number of protons in the nucleus of an atom of a substance |
| chemical change | change in a substance that produces a new substance with new and different properties |
| chemical property | property of matter that descrobes how a substance changes inot a new substance |
| compound | any combination of two or more different kinds of atoms |
| density | mass per unit of volume |
| mass | amount of matter in an aobject |
| mass number | total number of protons and neutrons in an atom |
| mixture | two or more substances physically combined |
| molecule | smallest part of any substance that still has all the properties of that substance |
| neutron | subatomic particle with no electric charge |
| nucleus | center of an atom |
| physical change | change ina substance that does not produce a new kind of substance |
| physical property | property of a substance that can be determined without changing the substance into a new kind of substance |
| plasma | very high energy phase of matter |
| proton | positively charged subatomic particle |
| solid | phase of matter that has a definite shape and a definite volume |
| specific gravity | ratio of the mass of a substance to the mass of an equal volume of water |
| volume | amount of space an object takes up |
