17: chlorine, Cl, used to purify water, combines with sodium to make table salt, 18: argon, Ar, often used to fill double-glazed windows, 19: potassium, K, sends off purple-red flaming drops when exposed to water, bananas have a lot of it, 20: calcium, Ca, in chalk and bones but a firm, silvery metal in its pure form, 21: scandium, Sc, sometimes added to aluminum to strengthen it, 22: titanium, Ti, lightweight and strong, used in airplanes, 23: vanadium, V, traces of this element give emerald a green color, 24: chromium, Cr, often used to plate objects and make them shiny,
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Periodic Table 17-24
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Caseybtinsley
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Chemistry
periodic table
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