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    Jayyouellwhyee's Avatar
    Jayyouellwhyee Posts: 2, Reputation: 1
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    #1

    Aug 15, 2010, 01:37 AM
    Chem
    The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance atomic masses are 69.2% for mass=62.9 amu, and 30.8% for mass= 64.93 amu. Calculate the average atomic mass of cooper.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 15, 2010, 02:46 AM
    The relative atomic mass of copper here, is the weighted average of each isotope.

    For example, Take Bromine. There are two isotopes of Bromine, namely Br-79 and Br-81, each being of 50% abundance.

    The relative atomic mass of bromine is therefore given by:



    Can you try this for copper now?
    mannie72896's Avatar
    mannie72896 Posts: 1, Reputation: 1
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    #3

    May 10, 2012, 03:30 PM
    Describe the relationship between atomic radii and atomic number for the group A elements in the first four periods.

    If you can answer this thank you!

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