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You are looking at two isotopes of arsenic. Both have no electrical charge and have 33 electrons, but the first has a mass of 73

You are looking at two isotopes of arsenic. Both have no electrical charge and have 33 electrons, but the first has a mass of 73 and the second has a mass of 75.

How many protons does the first isotope have?

How many neutrons does the first isotope have?

How many protons does the second isotope have?

How many neutrons does the second isotope have?

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