Question
Download Solution PDFWhen was the electron discovered?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 1897.
Key Points
- Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of the cathode rays.
- Proton was discovered by Ernest Rutherford.
- By his experiment, nitrogen under alpha-particle bombardment ejects what appear to be hydrogen nuclei. he had accepted the hydrogen nucleus as an elementary particle, naming its proton.
Additional Information
|
COMPONENT |
MASS (gm) |
CHARGE |
DISCOVER BY |
|
Electron |
9.11×10-28 |
|
J.J. Thomson |
|
Proton |
1.6727×10-24 |
|
Ernest Rutherford |
|
Neutron |
1.6750×10-24 |
|
James Chadwick |
Important Points
- Rutherford's gold foil experiment showed that the atom is mostly space with a tiny, dense, positively charged nucleus.
- Rutherford proposed the nuclear model of the atom.
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