Explanation

The elements with atomic numbers greater than 92 (uranium) in the periodic table are transuranium elements, including neptunium (Np), plutonium (Pu), americium (Am), curium (Cm), berkelium (Bk), californium (Cf), einium (Es), rare earth (Fm), rare earth (Md), nanometer (No), lawrencium (Lr), plutonium (Bh), rare earth (Hs) and other elements. The atomic number of these elements exceeds that of uranium (92), and their nuclear properties change with the increase of atomic number, including α Decay and spontaneous fission. The preparation of these elements usually requires artificial synthesis methods, as their probability of existence in nature is very low. Generally, there are two methods to prepare transuranium elements: 1. Under the conditions of reactor or nuclear explosion, the 235U isotope of uranium captures neutrons for many times, generates new neutron rich isotopes, and then obtains heavier transuranium elements through radioactive decay. 2. Use an accelerator to bombard ions with elements with higher atomic numbers, forming intermediate composite nuclei, and then evaporate charged and uncharged particles to form new heavy elements. These transuranium elements are widely used in the field of nuclear physics research and nuclear engineering. However, due to the short half life of some nuclides and the small output, they have certain challenges in practical application.

Classification