Who discovered that atoms are Uncuttable?
Who discovered that atoms are Uncuttable?
Democritus
When did Dalton Discover atoms of the same element are exactly alike?
Atomic Timeline
| A | B |
|---|---|
| Electrons are found in electron clouds, not paths. | 20th Century |
| Atoms of the same element are exactly alike. | Dalton |
| Atoms constantly move. | Democritus |
| All substances are made from atoms. | Dalton |
Who conducted experiments to determine the charge of an electron?
Robert Millikan
Who said his theory of atomic structure led to the plum pudding model?
Thomson’s
Why do alpha particles pass through gold foil?
All was explained! The dense atomic centers (each later called a “nucleus”) of the gold atoms were so small that most of the alpha particles zoom right through as if there was nothing there.
Which conclusion is based on the gold foil experiment?
The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil 1) An atom is mostly empty space with a dense, positively charged nucleus.
What are three differences between electrons and neutrons?
Electrons surround the nucleus. These three particles are compared with their properties and listed below….Given below in a table is the comparison between protons, neutrons and electrons:
| Proton | Neutron | Electron |
|---|---|---|
| They are positively charged | They are neutral | They are negatively charged |
Is neutrons negative or positive?
Proton—positive; electron—negative; neutron—no charge. The charge on the proton and electron are exactly the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom.