Technetium is a radioactive chemical element with symbol Bk and atomic sequence 97, belonging to actinides and transuranic elements. Technetium was discovered in1949 65438+February by Lawrence Berkeley National Laboratory in Berkeley, California, USA.
So technetium is named after Berkeley. Technetium is the fifth transuranic element discovered after americium (93), plutonium (94), americium (95) and curium (96).
Chemical properties of BK:
Like all actinides, thulium is soluble in various inorganic acid solutions and releases hydrogen when it is converted into Bk. This trivalent oxidation state (+3) is particularly stable in aqueous solution, but tetravalent (+4) thulium compounds also exist. The divalent (+2) thulium compound may also exist, but it is still uncertain. Terbium is a lanthanide isotope of thulium, which has similar characteristics.
Bk is green in most acidic solutions, yellow in hydrochloric acid and orange in sulfuric acid. Technetium will not react violently with oxygen at room temperature, which may be because an oxide protective layer is formed on its surface. In addition, thulium will react with molten metal, hydrogen, various halogens, oxygen group elements and nitrogen group elements to form various binary compounds.
Refer to the above? Baidu encyclopedia -bk