the atomic number of yttrium is 39. the atomic mass of one of its isotopes is 89. how many neutrons are in an atom of this isotope? | Cheap Nursing Papers
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the atomic number of yttrium is 39. the atomic mass of one of its isotopes is 89. how many neutrons are in an atom of this isotope?

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the atomic number of yttrium is 39. the atomic mass of one of its isotopes is 89. how many neutrons are in an atom of this isotope?

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