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360
Aritstotle (384BC-322BC)
At around 360BC Aristotle disagreed with Democritus's theory. Aristotle said that there were no atoms and that everything was made of the four elements, fire, water, wind and earth. He was significant because he slowed down the evolution of the atom. -
400
Democritus (460BC-370BC)
Around 400 BC Democritus developed a theory that everything on earth was made of atoms. Democritus' atomic model was just a round sphere with no electrons, protons or neutrons. His contributon to the atom was that he formed the basis of the further theories to come. -
Giordano Bruno (1584-1600)
During the time he was alive, Giordano Bruno believed that God was in every atom. He was significant to the development of the atom because this said that transubstantiation was impossible which went against the teachings of his Catholic faith. -
Robert Boyle (1627-1691)
Boyle chiefly studied gases. He mentioned the likelihood of atoms existing, but his work was greatly obstructed by the church. He tried alchemy or turning regular metals into gold. He created gas chambers to review from in contrast to the greek philosophers, he was doing physical experiments. He planned that parts area unit composed of 'corpuscles' of varied sorts and sizes that area unit ready to organize themselves into teams that represent totally different chemical substances. -
Isaac Newton (1643-1727)
Isaac Newton also studied gases like Boyle. In general, Isaac Newton believed that there were small pieces of mass moving everywhere. Isaac Newton made a major discovery by saying this because he was the first to come up with the idea that atoms are not stationary but moving. -
Antoine Lavoisier (1743-1794)
Lavoisier was famous for his experimentation skills. Lavoisier found out that water is made of hydrogen and oxygen. One of his favourite experiments was converting HgO into Hg+O. He used this experiment to come up with the Law of Conservation. The law states that matter can not be created or destroyed. He additionally hints at the arranging of matter in reactions. Matter rearranged, however never disappeared. He was significant because he started to show what an atom really was. -
Joseph Proust (1754-1826)
Joseph Proust discovered the Law of Definite Proportions. The law basically says that the ratio of elements in a compound is always the same. He also believed that matter could be put together to form different matter. -
John Dalton (1766-1844)
Dalton did lots of research to come up with his theory that matter is composed of extremely small particles called atoms, atoms are indestructible and can't be divided, atoms of an element are identical in their properties, atoms of different elements have different properties, and in a chemical bond the atoms separate, combine, or rearrange. He was significant because his theory is still used today. -
J.J. Thomson (1856-1940)
Thomson created something called the cathode ray. When a high voltage is sent through it, atoms move to the outer edges and the tube glows. He thought of atoms as a plum, it's mostly positive with a few negative charges. This was a significant breakthrough because it later helped in determining the charge of an electron. -
Niels Bohr (1885-1962)
Niels Bohr was the most important because he suggested that electrons didn't go around the nucleus but instead orbit on 'shells'. Bohr's atomic model is still used today and he also won a Nobel Prize for it due to it being near flawless. His contribution to the atom was the 'Bohr' atomic model. -
James Chadwick (1891-1974)
James Chadwick discovered neutrons. He discovered that a neutron can break through the nucleus of an atom. This was an important discovery he was the first to find out about the neutron.
