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16 February, 16:58

If an isotope of an element has 40 neutrons and a mass number of 79, how many electrons must it have?

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  1. 16 February, 18:29
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    Answer: 39 electrons

    Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.
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