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The ancient Greek philosophers had talked about atoms, but Dalton's theory was different in that it had the weight of careful chemical measurements behind it. It wasn't just a philosophical statement that there are atoms because there must be atoms. His atomic theory had these fundamental points :
- Elements consist of tiny particles called atoms.
- Elements are pure because all atoms of an element are identical and that in particular they have the same mass.
- Elements differ from one another because atoms of each element are different from one another; in particular, they have different masses.
- Compounds consist of atoms of different elements combined together. Compounds are pure substances (remember they cannot be separated into elements by phase changes) because the atoms of the different elements are bonded to one another somehow, perhaps by hooks, and are not easily separated from one another.
- Compounds have constant composition because they contain a fixed ratio of atoms and each atom has its own characteristic weight, thus fixing the weight ratio of one element to the other.
- Chemical reactions involved the rearrangement of combinations of the atoms in a substance.
Dalton's Atomic Theory had several main points, which are variously grouped into five statements :
1) All matter is made of atoms.
2) Atoms of a given element are identical in size, mass and chemical properties.
3) Atoms of different elements have different masses and properties.
4) Compounds are formed by a combination of two or more different kinds of atoms. The elements combine in simple, whole-number ratios.
5) Atoms cannot be subdivided, created, or destroyed, but merely rearranged in their compounds with other elements. They can be combined, separated, or changed in the way in which they are arranged.
Wiki User
∙ 13y ago
Wiki User
∙ 7y agoJust like Democritus, Dalton proposed that atoms cannot be divided. According to Dalton, all atoms of a givin element were exactly alike.
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The two types of main ideas are stated and implied ones.
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A hypothesis begets research. That research either denies the hypothesis, or confirms it and makes it a theory.
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The idea that atoms are indivisible.
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What was the main contribution of de Broglie to atomic theory?
See the link below
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Michael Faraday's main contribution to atomic theory was his work on electrolysis, which demonstrated that chemical compounds are composed of discrete particles and that these particles carry an electric charge. This provided evidence for the existence of atoms and laid the foundation for the development of the modern atomic theory.
Which scientist explained the atomic theory?
there were many scientists that contributed towards it but Joseph j. Thomson, Hans geiger, ernest marsden. ernest Rutherford, Henry moseley and James chadwick all made key discoveries and are the main scientists behind the theory.Alfred Nobel,Mendeleev and Neil Bhorbecause theire are the great scientistChadwick explain the atomic theoryniels hendrik bohrmitchell creech
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Actually, Albert Einstein is credited with formulating the theory of relativity, not John Palton. The theory of relativity revolutionized our understanding of space, time, and gravity, with two main branches: special relativity and general relativity.
What is the main reason Jhon Dalton famous or remembered?
John Dalton is famous for his work in developing the atomic theory of matter, which states that all matter is composed of tiny, indivisible particles called atoms. He also pioneered the concept of atomic weights and made significant contributions to the field of chemistry.
Does Dalton's 4 of atomic theory exists today?
Yes, Dalton's atomic theory is still relevant today. While some parts of his theory have been modified or expanded upon based on new scientific discoveries, the main principles of atoms being the building blocks of matter and elements being composed of individual atoms remain key concepts in modern atomic theory.
What was Democritus' main contribution to the atomic theory?
Democritus proposed that all matter is made up of tiny, indivisible particles called atoms. He also suggested that atoms have different sizes, shapes, and properties, which combine to form different substances. Democritus' ideas laid the foundation for the modern atomic theory.
