Table of Contents
Who first conducted experiments in combining elements?
Scientist who contributed to the modern atomic theory.
| Question | Answer |
|---|---|
| He conducted experiments in combining elements. | Dalton |
| His theory of the atmoic structure led to the “plum-pudding” model. | Thomson |
| There are small negatively charged particles inside the atom. | Thomson |
| He conducted the cathode-ray tube experiment. | Thomson |
Who conducted the gold foil experiment?
Ernest Rutherford
Read more about Ernest Rutherford, the physicist whose gold-foil experiment revealed key information about the structure of atoms.
Who discovered that all atoms of the same element are exactly alike?
John Dalton
A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates: (1) Elements consist of indivisible small particles (atoms). (2) All atoms of the same element are identical; different elements have different types of atom.
Who discovered that atoms are Uncuttable?
Dalton theorized that all matter is made of atoms. Atoms are too small to see, “uncuttable,” and indestructible. All atoms of a given element are exactly alike and atoms of different elements are different.
Who discovered electron proton and neutron?
Discovery of Electrons, Protons and Neutrons
| Discoverer | Year of Discovery | |
|---|---|---|
| Proton | E. Rutherford | 1909 |
| Neutron | James Chadwick | 1932 |
| Electron | J.J. Thomson | 1897 |
What was Democritus Discovery?
Democritus was a Greek philosopher who lived between 470-380 B.C. He developed the concept of the ‘atom’, Greek for ‘indivisible’. Democritus believed that everything in the universe was made up of atoms, which were microscopic and indestructible.
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