Moscovium
Moscovium is a radioactive element in group 15, period 7, block p, with atomic number 115 and symbol Mc. In Antimonia, a relatively stable isotope Mc-301 has been found, while Mc-290 that prepared by Earthlings has the half-life of only 0.65 second. It is an yellowish-grey metal, has a certain degree of toxicity, and its melting point is rather low.
Moscovium has some difference properties from other pnictogens. Due to the stability of atomic structure of flerovium, the most stable valence of moscovium is +1, which can form a covalent binary hydride McH. Moscovium and thallium have significant similar properties, so moscovium may take thallium's place in some applications not related to toxicity. For example, according to the similarities in structure and chemical properties of McI and TlBr, moscovium(I) iodide can be used as a photochemical crystal instead of thallium(I) bromide; and their monovalent hydroxides all have strong alkalinity. Though they both have strong oxidizing properties in trivalent form, they can both form trivalent hydrides.
History
Discovery
In 1735, a group of superscientists leaded by Zhao Mingyi and some Fluorian and Oxylan superscientists discussed about synthesizing element 115 in National Laboratory of Fluore. Old Eight first proposed to use the law of conservation of letters for synthesis. Though element 115 had not been named, it could be synthesized according to the law of ordinal superposition in the general law of conservation of letters. Element 115 would be formed by fagonging to fermium and phosphorus theoretically, but phosphorus and fermium preferentially underwent the law of conservation of letters to form MPF (maturation promoting factor), which deeply confused superscientists.
In 1740, when Lei Shaowu was playing Yourscraft in his home in Antimonia, he put plenty of Bk-249 and Sc-48 into a fagonging machine. Then they intensely reacted, producing plenty od neutronium and hydrogen, and formed a grayish yellow metal. After examination, it was the very element 115 that had not been synthesized 5 years ago.