1. Explain how the atomic number and mass number of an atom can be used to determine the number of electrons and of neutrons respectively.

Because the total of neutron and proton/electron is the atomic mass. So if you wanna find proton/electron and you know the neutron, just minus the atomic number with the neutrom and you will get the proton

Here if you need the formula

Atomic number = Total neutron + Total proton or electron

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explanation:

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus