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Democritus
. Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. He believed that there are an infinite number of atoms. This hypothesis was created in 465BC. This is Democritus' atomic theory exactly:
1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement. -
Aristotle
Aristotle has been hailed as the greatest scientist of all time. He examined everything from astronomy to zoology. He was among the first people to try to understand events by looking for natural causes. Before that, people believed that what happened was a direct consequence of the will of the gods. For nearly 2,000 years, his conclusions about the world were rarely challenged. While modern scientific inquiries have proved that he was not always right, his methods of close observation are still -
John Dalton
Dalton's Atomic Theory
1) All matter is made of atoms. Atoms are indivisible and indestructible. 2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms. His atomic theory said that elements consisted of tiny particles called atoms. It states an element is one of a kind (aka pure) because all atoms of an element are identical. All the atoms that m
