370 BC) Democritus, ancient Greek philosopher, a central figure in the development of philosophical atomism and of the atomic theory of the universe. Democritus (/dɪˈmɒkrɪtəs/ Greek: Δημόκριτος, Dēmókritos, meaning "chosen of the people" c.Sadly, he was executed by guillotine on during the French reign of terror. He discovered that, although matter may change its form or shape, its mass always remains the same. He predicted the existence of silicon (1787) and was also the first to establish that sulfur was an element (1777) rather than a compound. Lavoisier helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature.
Lavoisier established the Law of Conservation of Mass, and chemistry became an exact science, one based on careful measurement. He improved science by providing both qualitative and quantitative data. Marie Lavoisier pictured with Antoine was his assistant) Lavoisier disproved Aristotle and established Chemistry as a Science. He developed a list of 33 elements into four "element" groups.
Thus, he concluded that substances that decompose based on a physical change or chemical change are not elements. So water and air can't be elements because they are built from something simpler. Lavoisier made water from Hydrogen and Oxygen the air is made from Oxygen and Nitrogen.
They had been promoting Earth, Fire, Air, and Water as elements for over 2000 years. Antoine Lavoisier, considered the Father of Chemistry Discovered that water is not an Element disproving Empedocles 494BC, Plato, and Aristotle.
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