tCH 3.2 - Review History Dalton's 5 theories diatomic gases...

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Review History Dalton’s 5 theories diatomic gases Subatomic particles protons neutrons electrons
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Isotopes Isotopes are atoms of the same element that have  different mass numbers If the identity of an element is determined by the  number of protons what atomic particle must vary  in an isotope?
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Isotope Practice How many neutrons are in U-238 (Atomic # of  92) 1) 92 2) 238 3) 146 4) 330
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Element  Element   Atomic Mass  Atomic Mass Atomic mass:  Atomic mass:  Actual mass of atoms Actual mass of atoms Unit: atomic mass unit (amu) Unit: atomic mass unit (amu) 1 amu = 1/12 mass of  1 amu = 1/12 mass of  12 12 C atom  C atom  12 12 C:  C:  12 12  amu = 1.99265 x 10  amu = 1.99265 x 10 -23 -23  g  g 13 13 C: 13.00335 amu = 2.15936 x 10 C: 13.00335 amu = 2.15936 x 10 -23 -23  g  g Weighted average atomic  Weighted average atomic  mass mass Average atomic mass of  Average atomic mass of  isotopes according to their  isotopes according to their  natural abundance natural abundance = 1.66054 x 10 = 1.66054 x 10 -24 -24 g g
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Element  Element   Atomic Mass  Atomic Mass
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tCH 3.2 - Review History Dalton's 5 theories diatomic gases...

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