Per Teodor Cleve

2026-01-21 09:30:39

Per Teodor Cleve (Stockholm, Sweden, February 10, 1840 – April 18, 1905, Uppsala, Sweden) was a Swedish chemist, mineralogist, and oceanographer. He is known for the discovery of two new chemical elements, holmium and thulium (1879). He discovered a mineral, a variety of uraninite, containing rare earth elements (1874). This mineral was later named cleveite in his honor. He demonstrated that scandium, discovered by L. F. Nilsson, completely corresponds to ekaboron, predicted by D. I. Mendeleev (1879). He was a member of the Royal Swedish Academy of Sciences (1872). He was awarded the Davy Medal (1894).