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Metals: iron (construction, tools), copper (wires, pots), aluminium (aircraft, utensils, foil), gold/silver (jewellery, electronics), zinc (galvanizing, batteries), titanium (aerospace). Non-metals: oxygen (breathing), nitrogen (fertilisers, food packaging), carbon (fuels, diamonds, pencils), silicon (chips, solar cells), iodine (antiseptic, thyroid health), chlorine (water purification).