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OpenStudy (cometailcane):
Zirconium, Zr, and hafnium, Hf, are metals. An isotope of zirconium has 40 protons and 91 nucleons. a) i. write the isotopic symbol for this isotope of zirconium ii. how many neutrons are present in one atom of this isotope?
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OpenStudy (anonymous):
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