On February 19, 2010 (January 6, 2010 in the lunar calendar), the 112 chemical element Cn received its official name. February 19, 2010: Chemical element No. 112 Cn received its official name. The International Chemical Union announced on February 19 that chemical element No. 112 has been officially named "Copernicum" and the corresponding element symbol is "Cn". New members have been added to the periodic table of chemical elements! The mass of the new element's atom is about 277 times that of hydrogen and is currently the heaviest atom officially recognized