1800's
Atoms are made up of smaller particles.
John Dalton. He put forward the atomic theory in 1808.
They both thought the same theory but Dalton had evidence to prove it, unlike Democritus.
No b/c Thomson discovered that atoms can be cut. He found this out while studying rays traveling between charged metal plates in a vacuum tube. He discovered that the rays were consisted of negatively charged particles. He had just discovered electrons. He discovered all of this on a trip from America. Since electrons are so small, he believed that they could only be from inside of the atom. Since Thomson's discovery of the electron, John Dalton's theory that atoms are indivisible had to be changed.
john dalton developed the atomic theory , which he published in 1803
John Dalton developed the atomic theory.
The third principle of Dalton atomic theory is no supported.
Atomic theory was founded by John Dalton. He proved this theory in 1803.
John Dalton first pursued research into atomic theory. He was the first person to propose the existence of the atomic structure.
John Dalton made a great stride in chemistry with his atomic theory of matter and the idea of atoms and molecules became the established fact and the concept of atomic weight was also given by him
Dalton's theory was irrelevant to the total compensation of of the Atomic Mass.
John Dalton discovered the atom in 1803. He didn't really discover the atom. He developed a theory of matter that involved atoms. Atoms were proved to exist later.