| Term | Definition |
|---|
| Law of the conservation of mass | mass is neither created or distroyed during ordinary chemical reactions or physical changes |
| law of definite proportional | the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample |
| law of multiple proportions | if two or more different compounds are compsed of the same two elements, the the raio of the masses of the second element combined with a certain mass of the first elements is alwasy a ratio of `small whole numbers |
| nucleus | a very small region located near the center of an atom |
| proton | positive charged particle located inside the nucleus |
| neutron | a neutral charged particle located inside the nucleus |
| electron | an negative charged aprticle located outside the nucleus |
| CRT | Cathode Ray Tube |
| atomic number | the number of protons in the nucleus of an atom |
| Isotopes | atoms of the same element that have different atomic masses |
| nuclide | a general term for any isotope of any element |
| atomic mass unit | exactly 1/12 the mass of a carbon 12 atom |
| average atomic mass | the weighted average of the atomic massess of the naturally occurring isotoples of an atom |
| mole | is the amount of a substance that contains as many partices as there are atoms in exactly 12 grams of carbon-12 |
| 6.023*10 to the 23rd power | Avogadro's number |
| molar mass | the mass of one mole of a substance |
| mole | Avogadro's number |
| atomic mass | the number of protons and neutrons in an atom |
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