Atomic Number - The number of protons in an atoms nucleus., Mass Number - The number of protons and neutrons in an atoms nucleus., Relative Atomic Mass - The mass of an atom compound to the mass of an atom of carbon-12, Protons - Are positive, Neutrons - Are Neutral., Electrons - Are negative., RAM for water - 18, RAM for carbon dioxide - 44, RAM for methane - 16,

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