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Quark et al.
Sections 10-2 and 10-3.
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| A | B |
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| Quarks | particles of matter that make up protons and neutrons |
| Atomic mass units | the mass of a proton or neutron |
| isotopes | atoms of the same element that have a different number of neutrons |
| Mass number | the sum of the number of protons and neutrons |
| number of neutrons | Mass number - atomic number |
| Average atomic mass | it the average mass of the mixture of an elements' isotopes |
| C | carbon |
| H | hydrogen |
| O | oxygen |
| N | nitrogen |
| S | sulfer |
| Cl | Chlorine |
| Na | sodium |
| Ca | Calcium |
| Mg | magnesium |
| K | potassium |
| Hg | mecury |
| Au | gold |
| Ag | silver |
| Al | aluminium |
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