Sulfur makes egg yolks yellow and makes rotten eggs stink. Chlorine is very active and is used in acids and bleaches which kill germs. Chlorine and sodium make salt. Argon is the inert gas in regular light bulbs. Calcium is in milk, bones, teeth, shells, pearls, chalk, plaster, cement, and other white things.
Scandium causes the blue-green color in aquamarine gems.
Titanium is the strongest pure metal and is used in high-performance jets. Vanadium steel is resilient and is used in springs. Chromium is shiny and is used in car trim. Manganese steel is tough and is used in rock crushers. Iron is the most commonly used metal.