Berzelius (1779-1848) accurately determined more than 2000 relative atomic and molecular masses. He was the first to prepare silicon in its amorphous form and to isolate zirconium. He proposed oxygen as a reference standard for atomic masses and devised the system of chemical symbols and formulae now in use. His discoveries include the elements cerium (1804), selenium (1817), and thorium (1828).

References:
University College, Cork, website http://www.ucc.ie/ucc/depts/chem/dolchem/html/biog/biog001.html

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