The atomic theory of John Dalton is from 1801-1802.
give atomic mass of elements
The term used by Democritus to identify the particles of an element is atomic theory. It was thought up by John Dalton between the years 1766 and 1844.
It depends. If you mean just any old atomic theory, credit usually goes to either Democritus or his mentor Leucippus. However, if you mean an atomic theory that wasn't totally blowing smoke out their nether regions, was backed up by actual experimental data, and at least resembled the truth in certain ways if you squinted hard enough, I'd say John Dalton is probably your guy.
The contribution of anyone prior to about 1600 to the development of atomic theory might as well be "nothing whatsoever." Democritus and/or Leucippus contributed the name "atomos", but not much else; they were wrong about nearly every detail. John Dalton is just about the earliest scientist to have had any significant contribution to atomic theory, and most of what we now consider atomic theory was developed since about 1900.
John Dalton. He put forward the atomic theory in 1808.
john dalton developed the atomic theory , which he published in 1803
John Dalton developed the atomic theory.
John Dalton
1803
John Dalton
John Dalton first pursued research into atomic theory. He was the first person to propose the existence of the atomic structure.
Atomic theory was founded by John Dalton. He proved this theory in 1803.
scientific method used in the development of atomic theory
This quote is attributed to British physicist and chemist John Dalton, who proposed the atomic theory of matter in the early 19th century. Dalton's theory stated that all atoms of a given element are identical and have specific characteristics that differentiate them from atoms of other elements.
John Dalton
Atomic Theory.