An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?
If we are considering the charge of the nucleus, then there are only the protons that can contribute to the charge as they have a charge of +1+1. Thus the charge of the atom's nucleus is +25 with 25 protons in it. But if asked the overall charge of the atom, then it would be 0. As the −25−25 charge from the electrons will cancel out the +25+25 charge of protons.
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