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Alkali metals ? Earth metals ? Metals ? Non-metals ? Halogens ? Noble gases ? Alkaline Earth metals ? Other metals ? Noble gases ? Metals ? Transition metals ? Non-metals ? Alkali metals ? Non-metals ? Increasing reactivity ? Group 1 ? Group 2 ? Electron donors ? Period 2 ? Most reactive elements ? Period 3 ? 3 valence electrons ? 5 valence electrons ? Electron stealers ? Unreactive - very stable ? The symbol for this element = Total number of protons = Number of valence electrons = Total number of electrons = Neutron ? Electron orbital ? Nucleus ? Electron ? Proton ? |