Ostwaldium

Ostwaldiun or quad- (systematic name quadunennium (Que) is the hypothetical chemical element with the symbol Od and atomic number 419. It is the 9f$5$ coordinate or simply family. This element is named after the, a German chemist. It is not found in nature and it can only be created inside a laboratory. Ostwaldium's isotopes very unstable. The most stable, $1288$Od half-life is 25 yoctoseconds (2.5x10$-23$ seconds).