One isotope of lead has 82 protons and 124 neutrons in its nucleus. what is the number of protons in the nucleus of any other isotope of lead?

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Bromine has atomic number  35  which means there are  35 protons  and  44  neutrons to give a total of 79 nucleons. the fact that it's a positive ion means that it has lost an electron; so there'll be  34 electrons.