Rb-87

Rubidium-87 (Rb-87) is a rare isotope of the element rubidium, meaning it has a nucleus with 37 protons and 50 neutrons. It is notable for its use in highly precise atomic clocks, which measure time with extraordinary accuracy, critical for GPS systems and scientific research. Rb-87’s atomic properties make it ideal for experiments in quantum physics and timekeeping. It is naturally occurring in small amounts and is stable, not radioactive. Its unique nuclear characteristics allow scientists to study fundamental physical phenomena and improve technologies relying on precise frequency standards.