1) Chemist 2) German surname 3) Martin heinrich klaproth 
[crater] Klaproth is an old lunar crater that lies in the rugged southern highlands of the Moon`s near side. Due to its location, this crater appears significantly foreshortened when viewed from the Earth. The southern rim of the crater is overlain by the similar-sized crater Casatus, and to the north-northeast lies Blancanus. The outer rim...
[n] - German chemist who pioneered analytical chemistry and discovered three new elements (1743-1817)