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10 Cards in this Set
- Front
- Back
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What are the three subatomic particles?
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nuetrons, protons, electrons
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True or False? Elements aren't different because they contain the same number of protons.
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False, they are different because they contain different numbers of protons
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atomic number
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the number of protons in the nucleus of an atom
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mass number
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the total number of protons and neutrons
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if you know the atomic number and the mass number of an atom of any element, you can find the atoms composition?
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true
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the difference between the mass number and atomic number is...
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the number of neutrons
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isotopes
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atoms that hve the same number of protons but different numbers of neutrons.
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isotopes of an element have different numbers of neutrons thus they have different...
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mass numbers
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atomic mass units (amu)
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one twelfth the mass of the Carbon12 atom
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atomic mass
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is the weighted average mass of the atoms in a naturally occurring sample of the element.
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