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a neutral atom has a mass number of 80 and has 45 neutrons. write its complete symbol?
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- suzyLv 51 decade agoFavorite Answer
Mass number is the number of protons + neutrons so 80 = protons + 45. Therefore number of protons is 35. Now look at the periodic table and see which element has the atomic number of 35. I think you'll find it is Br (Bromine).
Source(s): chemistry teacher
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