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9 Cards in this Set
- Front
- Back
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Atomic number =
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Number of PROTONS
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Mass number =
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Number of PROTONS AND NEUTRONS
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Number of protons (for atoms) =
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Number of electrons
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For positive ions, number of protons will be ____ than number of electrons
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more
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For negative ions, number of protons will be ____ than number of electrons
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less
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Definition of relative isotomic mass
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The mass of an atom compared with one-twelfth of the mass of an atom of carbon-12
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Definition of relative atomic mass (Ar)
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The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12
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What is Ar?
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Relative Atomic Mass. Mass number of element (e.g. 16 of Oxygen)
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What is Mr?
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Relative Molecular Mass (Same as relative formula mass). Mass numbers of multiple elements added together. (E.g. Mr H2O = 18)
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