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Definition
| The smallest particle of an element that retains its identity in a chemical reaction |
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Term
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Definition
All elements are composed of tiny indivisible particles called atoms.
Atoms of the same element are identical.
Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds.
Chemical reactions occur when atoms are separated, joined, or rearranged. |
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Term
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Definition
| The number of protons in the nucleus of an atom of that element. |
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Term
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Definition
| The total number of protons and neutrons in an atom is the |
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Definition
| 1/12 of the mass of a carbon-12 atom. |
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Term
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Definition
| Weighted average mass of the atoms in a naturally occurring sample of the element. |
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Definition
| Each horizontal row of the periodic table. |
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Term
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Definition
| Each vertical column of the periodic table |
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