The formulation of the periodic system by the Russian Mendeleev was followed by the surprising discovery of gallium by the Frenchman de Boisbaudran. The Englishman Ramsay’s explanation of an ‘impurity’ in air led to recognition of a new period.
A young fellow countryman, Moseley, justified the expected existence of 92 elements. A German couple, the Noddacks, found the last stable element, rhenium. The team of the American Seaborg created an element named after him. Truly 150 years of international discovery.