October 5th
- Dutch physicist who (working with Georg von Hevesy) discovered the element hafnium by skillfully applying Moseley’s method of X-ray analysis
- Niels Bohr had suggested they look closely at an ore of zirconium, a homologue, for the new element.
- Bohr heard by telephone of their success on the day of his Nobel Prize lecture (11 Dec 1922), in which he then announced their discovery.
