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what is the atomic number and atomic mass number for an isotope of Dy with 99 neutrons. Give two answers: first, the atomic number; then, the atomic mass number.

how many protons are in one atom of tin-119

how many neutron  in one atom of copper-64

Nov 20th, 2017

Dysprosium has atomic number = 66 , so the mass number is 99+66 = 165

All tin isotopes have 50 protons

Cu 64 has 35 neutrons

Jan 15th, 2015

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