Editing History of science (section)

===Developments in chemistry===
[[File:DIMendeleevCab.jpg|thumb|upright| right | [[Dmitri Mendeleev]]]]
In chemistry, [[Dmitri Mendeleev]], following the [[atomic theory]] of [[John Dalton]], created the first [[periodic table]] of [[Chemical element|elements]]. Other highlights include the discoveries unveiling the nature of atomic structure and matter, simultaneously with chemistry – and of new kinds of radiation. The theory that all matter is made of atoms, which are the smallest constituents of matter that cannot be broken down without losing the basic chemical and physical properties of that matter, was provided by [[John Dalton]] in 1803, although the question took a hundred years to settle as proven. Dalton also formulated the law of mass relationships. In 1869, [[Dmitri Mendeleev]] composed his [[periodic table]] of elements on the basis of Dalton's discoveries. The synthesis of [[urea]] by [[Friedrich Wöhler]] opened a new research field, [[organic chemistry]], and by the end of the 19th century, scientists were able to synthesize hundreds of organic compounds. The later part of the 19th century saw the exploitation of the Earth's petrochemicals, after the exhaustion of the oil supply from [[whaling]]. By the 20th century, systematic production of refined materials provided a ready supply of products which provided not only energy, but also synthetic materials for clothing, medicine, and everyday disposable resources. Application of the techniques of organic chemistry to living organisms resulted in [[physiological chemistry]], the precursor to [[biochemistry]].<ref>{{Cite journal|url=https://pubmed.ncbi.nlm.nih.gov/17152615/|title=History of biochemistry|first1=Parduman|last1=Singh|first2=H. S.|last2=Batra|first3=Manisha|last3=Naithani|date=6 January 2004|journal=Bulletin of the Indian Institute of History of Medicine (Hyderabad)|volume=34|issue=1|pages=75–86|via=PubMed|pmid=17152615}}</ref>