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18 Cards in this Set
- Front
- Back
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Element |
a pure substance (all same type of atom) represented by a chemical symbol on the periodic table |
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Periodic Table |
a chart that organizes elements in order of increasing atomic number |
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Atoms |
smallest amount of a substance that will still retain all the features of that substance |
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Compound |
2 or more elements that are chemically bonded and cannot be physically separated. Represented by a chemical formula (Ex: water H20) |
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Mixture |
2 or more substances (elements or compounds) that have not chemically reacted with each other. Can be physically separated |
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Physical change |
a change in the size, shape, or state of matter of a substance |
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Chemical change |
permanent changes in the arrangement of atoms that result in new substances |
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Reactants |
substances that are mixed together |
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Products |
substances that are made during a chemical reaction |
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Nucleus |
Center of an atom; contains protons and neutrons |
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Proton |
-Positively charged part of an atom -In nucleus of an atom -same as atomic number -number of protons determines the element |
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Neutron |
-no charge (neutral) -in nucleus of atom - atomic mass - atomic number = neutrons |
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Electron |
-negatively charged -oribit nucleus in the electron cloud (energy levels) -usually same as atomic number |
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Atomic number |
-number of protons in an atom -how elements are arranged on the periodic table |
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Atomic mass |
protons + neutrons |
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Period |
-Horizontal Row on the periodic table -tells the number of energy levels in an atom |
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Group |
-vertical column on the periodic table -elements in the same group have similar chemical properties |
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Energy level |
area where electrons orbit the nucleus of an atom 1st energy level can hold 2 electrons 2nd energy level can hold 8 electrons 3rd energy level can hold 18 electrons |
