The video explores lesser-known elements on the periodic table and their significant roles in technology. It covers praseodymium and neodymium's use in heat-resistant glass and powerful magnets, yttrium's role in YAG lasers, and the applications of radioactive elements like americium and californium in smoke detectors and oil extraction. Osmium's density and antimony's flame-retardant properties are discussed, along with gadolinium's use in MRI technology.

Explain why osmium is not commonly used in construction despite its density.

How does antimony contribute to fire safety in plastics?

What is the significance of gadolinium in MRI technology?