Which element was discovered by Hennig Brand in 1669?

Which element was discovered by Hennig Brand in 1669? Phosphorus. Brand, a German alchemist working in Hamburg, isolated phosphorus while searching for the philosopher’s stone, the legendary substance believed to transform base metals into gold. He obtained it by heating concentrated residues from urine, which contains phosphate compounds.

The material he produced was white phosphorus, a waxy substance that glowed faintly in the dark and could ignite in air. That unexpected glow made it seem almost magical, but it came from chemiluminescence: a chemical reaction with oxygen that produces light. Brand initially kept his method secret, as was common among alchemists, but the recipe later reached other researchers.

Phosphorus is often described as the first element discovered in the modern sense because it was not known from ancient times. The name comes from Greek and means “light-bearer,” a fitting reference to its luminous appearance. Later chemists developed safer ways to obtain phosphorus, and its compounds became important in fertilizers, detergents, matches, and biological molecules such as DNA and ATP.