Rubidium

Rubidium is a soft, silvery-white metal that's part of the alkali metal group, similar to lithium and sodium. It’s highly reactive, especially with water, producing hydrogen gas and a hydroxide solution. Rubidium is rare and typically used in scientific research, atomic clocks, and specialty electronics due to its precise frequency for measuring time. It has interesting quantum properties and can influence atomic behaviors. Because of its reactivity, it must be handled carefully. Although not common in everyday products, rubidium's unique physical and chemical properties make it valuable in advanced technology and scientific applications.