Atomic Number, Mass Number, and Net Electric Charge 

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7:56 I don't know chemestry, but on the Carbon Atom, it is not switch, I a mean A=6 and Z=13??? Please, let me know!!!

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What happens to electrons in the “Protons + Neutrons = Mass Number”

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is the number of proton still the same as the atomic number if the atom is negatively charged?

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I have a doubt, if average atomic number is not given. How to identify the difference?

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