John Daltons Theory Stated that:
- All matter is made up of atoms.
- Atoms are indestructible and indivisible.
- Atoms of the same element have identical properties and mass.
- A chemical reaction is a rearrangement of atoms.
- A compound is formed by a combination of two or more different kinds of atoms.
Cases where Daltons Theory is different:
- John Dalton’s theory stated that atoms of the same element have identical masses but modern theories have proved that atoms of the same element can have different masses, these atoms are called isotopes however they do have the same chemical properties.
- In modern research it was discovered that atoms can be destroyed by nuclear reactions but not by chemical reactions.
Name | Discovery/Theory |
---|---|
Democritus, 460 BC | Came up with the idea of atoms |
John Dalton, 1808 | After the idea of atoms was dismissed for over 2000 years, he reintroduced the idea of atoms and through many experiments he proved the existence of atoms. |
Joseph .J.Thompson, 1898 | Stated that positively charged substances were distributed uniformly over the surface of the atom containing electrons embedded within them. |
Ernest Rutherford, 1910 | From J.Thompson’s model and through his own experiments he was able to determine the true model of the atom. Instead of the positively charged particles being distributed over the atom they were gathered together in the nucleus. |
Niels Bohr, 1913 |
He came up with these rules:
|
Wolfgang Pauli, 1924 | Stated that electrons spin while orbiting the nucleus. He also came up with his own principle known as the Pauli Exclusion Principle which stated that no two electrons of a given atom can have the same set of quantum numbers. |
2 Response to Process of Theoretical Change: Dalton’s Atomic Theory
clears things up a bit..thanks
very well written
Post a Comment
Have a Question or a Comment?