Who created the first atomic theory?
The modern atomic theory, which has undergone continuous refinement, began to flourish at the beginning of the 19th century with the work of the English chemist John Dalton.
Who made the first atomic theory What did his theory say?
Dalton’s atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
What experiment did Antoine Lavoisier do for the atomic theory?
Lavoisier was able to decompose the red calx into mercury and oxygen, but he could find no way to break down oxygen into two or more new substances. Because of this he suggested that oxygen must be an element—an ultimately simple substance which could not be decomposed by chemical changes.
What did Antoine Lavoisier discover about the atom?
Lavoisier is most noted for his discovery of the role oxygen plays in combustion. He recognized and named oxygen (1778) and hydrogen (1783), and opposed the phlogiston theory. Lavoisier helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature.
When did Antoine Lavoisier discover mass?
The Law of Conservation of Mass (or Matter) in a chemical reaction can be stated thus: In a chemical reaction, matter is neither created nor destroyed. It was discovered by Antoine Laurent Lavoisier (1743-94) about 1785. Law of conservation of mass is discovered by Lavoiser in 1774
What year did Antonie Lavoisier discovered silicon?
Lavoisier helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He predicted the existence of silicon (1787) and was also the first to establish that sulfur was an element (1777) rather than a compound.
When did Antoine Lavoisier work or make important discoveries?
In 1772, Antoine Lavoisier conducted his first experiments on combustion. He reported that when phosphorus and sulphur are burned, they gained weight by combining with air and that the products were acidic. Lavoisier worked on combustion over the next fifteen years and his work ultimately disproved the phlogiston theory of combustion.