| A | B |
|---|
| atom | Smallest piece of an element which retains the properties of that element. |
| atomic mass number | Average atomic mass rounded to the nearest whole number. |
| atomic mass unit (a.m.u.) | 1/12 the mass of the carbon-12 atom. |
| atomic number | Number of protons in the nucleus of an atom. |
| alloy | A mixture of two or more metals. |
| chemical change | Change in which a substance becomes another substance having different properties. |
| compound | A substance containing two or more elements chemically combined. |
| conductor | A substance through which heat or electricity can flow readily. |
| diatomic | a molecule composed of two atoms |
| electron | Negetavely charged particle in an atom. |
| formula | group of symbols used to represent a compound. |
| horizontal | Level with the horizon or parallel to the ground. |
| isotopes | Atoms of the same element with different numbers of electrons. |
| matter | Anything that has mass and takes up space. |
| metalloid | Element, having properties of both metals and nonmetals. |
| neutron | Neutral Particle found in the atomic nucleus. |
| noble gas | A stable gas that usually does not combine chemically. |
| nucleus | The central portion of an atom containing neutrons and protons. |
| technology | Application of science for practical purposes. |
| theory | An explanation based on observations and experiments. |
| triatomic | Molecules composes of three atoms. |
| vertical | Extending up and down. |
| Volume | The amount of space matter occupies. |
