Per Teodor Cleve, Date of Birth, Place of Birth, Date of Death

Per Teodor Cleve

Swedish chemist who discovered holmium and thulium

Date of Birth: 10-Feb-1840

Place of Birth: Stockholm City, Sweden

Date of Death: 18-Jun-1905

Profession: zoologist, geologist, chemist, university teacher, mineralogist

Nationality: Sweden

Zodiac Sign: Aquarius

Per Teodor Cleve (10 February 1840 – 18 June 1905) was a Swedish chemist, biologist, mineralogist and oceanographer.
He is best known for his discovery of the chemical elements holmium and thulium.Born in Stockholm in 1840, Cleve earned his BSc and PhD from Uppsala University in 1863 and 1868, respectively.
After receiving his PhD, he became an assistant professor of chemistry at the university.
He later became professor of general and agricultural chemistry.
In 1874 he theorised that didymium was in fact two elements; this theory was confirmed in 1885 when Carl Auer von Welsbach discovered neodymium and praseodymium. In 1879 Cleve discovered holmium and thulium.
His other contributions to chemistry include the discovery of aminonaphthalenesulfonic acids, also known as Cleve's acids.
From 1890 on he focused on biological studies.
He developed a method of determining the age and order of late glacial and postglacial deposits from the types of diatom fossils in the deposits, and wrote a seminal text in the field of oceanography.
He died in 1905 at age 65.