what is mass number of an iron atom that has 28 neutrons?

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  • Anonymous
    1 decade ago
    Favorite Answer

    mass number = atomic number + neutrons

    iron atomic number is 26, so

    mass number = 26+28 = 54

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  • 3 years ago

    Mass Number Of Iron

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  • 3 years ago

    Iron Mass Number

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  • 4 years ago

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    what is mass number of an iron atom that has 28 neutrons?

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  • Betty
    Lv 4
    4 years ago

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    atomic number of iron is 26. that means it has 26 protons. and it has 28 neutrons. mass number of an atom is the number of protons and neutrons ie total number of nucleons in its atom. therefore mass number = proton number + mass number = 26 + 28 = 54

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  • Anonymous
    1 decade ago

    you have to add the number of neutrons to the number of protons to get the total mass number. so if you know the number of protons, subtract to get the mass number.

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