Mendelevium (atomic number 101, symbol Md) is a radioactive and synthetic element in the actinide series. It is named after Dmitri Mendeleev, whose periodic system classifies all chemical elements. IUPAC or the International Union of Pure and Applied Chemistry accepted the name mendelevium.
The element has 16 isotopes with masses from 245 to 260. The most stable isotope is mendelevium-258, and it has a half-life of 51.5 days. The isotope decays into einsteinium-254 through spontaneous fission or alpha decay. Mendelevium-257 has a half-life of 5.52 hours and mendelevium-260 - a half-life of 31.8 days. The other radioactive isotopes of the...Read More