44 given the balanced ionic equation:
3pb2+ + 2cr ==> 3pb + 2cr3+
what is the number of moles of electrons gained by 3.0 moles of lead ions?
(1) 5.0 mol (3) 3.0 mol
(2) 2.0 mol (4) 6.0mol
i know that the answer is 4 i just need an explanation of how

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl