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29 January, 20:03

Boron has an atomic mass of 11. How many neutrons are in its nucleus? Use the periodic table if you wish.

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  1. 29 January, 20:16
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    In a sample of boron, 20% of the atoms are B-10, which is an isotope of boron with 5 neutrons and mass of 10amu. The other 80% of the atoms are B-11, which is an isotope of boron with 6 neutrons and a mass of 11amu
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