Why is promethium considered an important element?

Overview. Promethium is one of the most fascinating of all chemical elements. It has never been found on the Earth's surface. Scientists know of it only because it can be prepared artificially in particle accelerators ("atom smashers") and in other unusual reactions. read more

Promethium is one of the most fascinating of all chemical elements. It has never been found on the Earth's surface. Scientists know of it only because it can be prepared artificially in particle accelerators ("atom smashers") and in other unusual reactions. Its existence was predicted as early as 1902, but its discovery was not confirmed until 1945. read more

Promethium is the only lanthanide and one of only two elements among the first 83 that has no stable (or even long-lived) isotopes. This is a result of a rarely occurring effect of the liquid drop model and stabilities of neighbor element isotopes; it is also the least stable element of the first 84. read more

bohr theory was the first to inourporate the concept of quanlized energy levels for electrons within atoms. read more