Geography
Geography, 25.09.2019 06:00, dedrell16

If the number of electrons in an atom is 39 and the mass number for the same atom is 90, calculate the the following for this atom: a) the number of protons b) the atomic number c) the number of neutrons d) what is the identity of this element?

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If the number of electrons in an atom is 39 and the mass number for the same atom is 90, calculate t...

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