Oxygen: Protons 8, Electrons 8, Helium: Protons 2, Electrons 2, Calcium: Protons 20, Electrons 20, Aluminium: Proton 13, Electron 13, Chlorine: Proton 17, Electron 17, Gold: Proton 79, Electron 79, Krypton: Proton 36, Electron 36, Mercury: Proton 80, Electron 80,

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