Cesium is a rare, silver-white ... You may like Groundbreaking atomic clock is off by less than 1 second every 100 million years There's 90,000 tons of nuclear waste in the US.

Even London's Big Ben relies on atomic clocks to keep it right. The first accurate caesium atomic clock was developed at the NPL in 1955 by Dr Louis Essen. But the idea was originally proposed by Lord ...

ATOMIC WEIGHTS OF CAESIUM AND RUBIDIUM.—M. Godeffroy gives an account in Liebig's Annalen of some determinations he has made on the above subject. To obtain pure material he employs Redtenbacher ...