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7 March, 23:35

What is the mass number of an ion with 109 electrons 159 neutrons and a + 1 charge? Express your answer as an integer

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  1. 8 March, 02:04
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    Z=atomic number (number of protons)

    The number of protons is similar to the number of electrons when the atom doesn't have charge.

    In this case:

    "+1 charge" means that this atom would must have 1 electron more to be neutral, therefore the number of electrons of this element would be 109+1=110.

    A=Z+N

    A=mass number

    Z=110 u

    N=159 u

    A=110 u + 159 u=269 u

    Answer: the mass number (A) would be 269 u
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