How many protons in Hydrogen?, 2, 1, 3, 4, how many electrons in carbon . It's atomic mass is 12?, 5, 7, 6, 4, what is the charge on proton?, no charge, -, +, what is atomic number?, No of protons in nucleuss, No of neutrons, No of protons and neutrons, only no of electrons, How to find no of neutrons in atom, A=Z+N, N=A-Z

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