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Definition
| negatively charged atom or molecule (contains more electrons than protons) |
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Term
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Definition
| average mass of atoms of an element, expressed in amu |
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Term
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Definition
| (also, unified atomic mass unit, u, or Dalton, Da) unit of mass equal to |
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Term
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Definition
| number of protons in the nucleus of an atom |
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Term
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Definition
| positively charged atom or molecule (contains fewer electrons than protons) |
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Term
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Definition
| one-, two-, or three-letter abbreviation used to represent an element or its atoms |
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Term
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Definition
| set of postulates that established the fundamental properties of atoms |
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Term
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Definition
| negatively charged, subatomic particle of relatively low mass located outside the nucleus |
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Term
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Definition
| formula showing the composition of a compound given as the simplest whole-number ratio of atoms |
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Term
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Definition
| electrically charged atom or molecule (contains unequal numbers of protons and electrons) |
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Term
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Definition
| compounds with the same chemical formula but different structures |
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Term
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Definition
| atoms that contain the same number of protons but different numbers of neutrons |
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Term
| law of constant composition |
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Definition
| (also, law of definite proportions) all samples of a pure compound contain the same elements in the same proportions by mass |
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Term
| law of definite proportions |
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Definition
| (also, law of constant composition) all samples of a pure compound contain the same elements in the same proportions by mass |
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Term
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Definition
| sum of the numbers of neutrons and protons in the nucleus of an atom |
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Term
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Definition
| formula indicating the composition of a molecule of a compound and giving the actual number of atoms of each element in a molecule of the compound. |
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Term
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Definition
| uncharged, subatomic particle located in the nucleus |
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Term
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Definition
| massive, positively charged center of an atom made up of protons and neutrons |
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Term
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Definition
| positively charged, subatomic particle located in the nucleus |
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