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7 July, 15:23

What is the mass number of an ion with 105 electrons, 157 neutrons, and a 1 charge?

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  1. 7 July, 18:20
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    Alright, first you have to understand that the mass number is simply the number of neutrons + the number of protons.

    However, they've only given you the electrons and the neutrons. Assuming that you meant "1 charge" and "+1 charge" that means you've got 106 protons and 157 neutrons.

    Mass number = neutrons + protons

    = 106+157

    = 263
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