This article is about Aktinum. Among the mendelbium isotopes known as 15 (between 245 and 260), the most known is MD.This is a 77 -minute half -life, and it collapses mainly through electronic capture.(α-line is ≈10%) Another alpha radiator is MD, which has a 53-day half-life.These isotest elements are produced in rare Einstine (ES and ES).Therefore, there is a limit to production.At the same time, the long -lived Nobelium isotope and Loren isotope (and heavier elements) have a relatively short half -life.Nobelium is known for 11 isotopes, and its mass is between 250 and 260 and 262.The chemical properties of Nobelium and Lauren are well known for NO (T1/2 = 3 minutes) and LR (T1/2 = 35 seconds).Among Nobelium's isotectic elements, NO has the longest 1.5 -hour half -life of Nobelium isotope.
What is the number of mass number of the isotope of Mendelbium?
260