Magnesium, Atomic number: 12 , Mg, 12 protons, 12 electrons, Selenium, Atomic number: 34, Se, 34 protons, 34 electrons, Bromine, Atomic number: 35, Br, 35 protons, 35 electrons, Hydrogen, Atomic number: 1 , H, 1 proton, 1 electron, Oxygen, Atomic number: 8 , O, 8 protons, 8 electrons, Gold, Atomic number: 79, Au, 79 protons, 79 electrons, Argon, Atomic number: 18, Ar, 18 protons, 18 electrons, Rubidium, Atomic number: 37, Rb, 37 protons, 37 electrons.
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