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2 August, 13:50

If an isotope of an element has 33 neutrons and a mass number of 64, how many electrons must it have?

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  1. 2 August, 14:03
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    The mass number is the sum of the protons and neutrons

    64 = #protons + #neutrons

    Find the number of protons given the number of neutrons

    64 = #protons + 33

    #protons = 31

    In a neutral element (such as this), the number of electrons equals the number of protons

    #electrons = #protons

    #electrons = 31
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