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Chemistry
Chemistry Chap 4.3
| Question | Answer |
|---|---|
| Elements are different because they contain different numbers of _____. | protons |
| atomic number | number of protons in the nucleus of an element |
| Atoms are electrically _________. | neutral |
| mass number | total number of protons and neutrons in an atom |
| The number 197 in Gold-197 is the _________. | mass number |
| Atoms that have the same number of protons but different numbers of neutrons | isotopes |
| atomic mass unit | Defined as 1/12 the mass of a carbon-12 atom |
| atomic mass | weighted average mass of the atoms in a naturally occurring sample of an element |
| A weighted average mass reflects both the mass and the relative ________ of the isotopes as they occur in nature. | abundance |
| The periodic table allows you to _____ the properties of different elements. | compare |
| period | horizontal row on the periodic table |
| group | vertical column on the periodic table |
| Elements in the same ______ of the periodic table have similar properties. | group |
| Units used to measure atomic masses | amu |
| The number of neutrons in an atom is the difference between the ____ number and the ____ number. | mass, atomic |
| Elements are arranged in the periodic table in order of increasing ______ ______. | atomic number |
Created by:
phersont
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