9: fluorine, F, a pale yellow gas that reacts violently with virtually everything, 10: neon, Ne, often used in signs, 11: sodium, Na, a main component of table salt, but violently reactive with water in its pure form, 12: magnesium, Mg, lightweight, used in race car components, 13: aluminum, Al, most abundant metal in Earth's crust, 14: silicon, Si, used in computer chips, 15: phosphorus, P, its red form is used in matches, 16: sulfur, S, volcanic, also called brimstone,

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