moscovium and symbol mc for the element 115
Moscovium Moscovium is an extremely radioactive element: its most stable known isotope, moscovium-290, has a half-life of only 0.8Â seconds.[8] In the periodic table, it is a p-block transactinide element. It is a member of the 7th period and is placed in group 15 as the heaviest pnictogen, although it has not been confirmed to behave as a heavier homologue of the pnictogen bismuth. Moscovium is calculated to have some properties similar to its lighter homologues, nitrogen, phosphorus, arsenic, antimony, and bismuth, and to be a post-transition metal, although it should also show several major differences from them. About 100 atoms of moscovium have been observed to date, all of which have been shown to have mass numbers from 287 to 290.
Mole (unit) The mole is the unit of measurement for amount of substance in the International System of Units (SI). The unit is defined as the amount or sample of a chemical substance that contains as many constitutive particles, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope of carbon with standard atomic weight 12 by definition. This number is expressed by the Avogadro constant, which has a value of approximately 7023602214085700000♠6.022140857×1023 mol−1. The mole is an SI base unit, with the unit symbol mol.