No, Cerium is a naturally occurring, rare earth, chemical element with the symbol Ce and atomic number 58. It was therefore not invented by anyone.
However, Cerium was discovered in 1803 by Jöns Jakob Berzelius and Wilhelm Hisinger working in Sweden, and independently in Germany by Martin Heinrich Klaproth.
Cerium hasn't odor.
Cerium is a soft, malleable, and ductile metal with a silvery-white appearance.
Cerium was not known by alchemists.
Cerium is a solid at room temperature and pressure.
Cerium is a silvery-white metal.
The cation of cerium is Ce(3+).
Cerium is reactive but not highly reactive.
Wilhelm Hisinger founded the elment cerium.
Ce is the chemical symbol for cerium
Cerium can be bi-, tri- or tetravalent.
Cerium's atomic number is 58. Thus, to be electrically neutral, cerium must have 58 protons and 58 electrons. 140Ce is its most abundant isotope with 140 - 58 = 82 neutrons.
cerium is reactive, if hit with a sharp object it will combust and release nitrogen and hydrogenated carbon. it is the most stable of the rare earth elements though