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Chapter 2: Problem 15

Which of the three subatomic particles was discovered first- the proton, neutron, or electron? Which one was discovered last?

Short Answer

Expert verified
The electron was discovered first by J.J. Thomson in 1897. The neutron was discovered last by James Chadwick in 1932.

Step by step solution

01

Researching Discoveries

To find out which subatomic particles were discovered first, we will need to research the years each particle was discovered in historical records.
02

Discovery of Electron

The electron was discovered by J.J. Thomson in 1897 through his cathode ray experiments.
03

Discovery of Proton

The proton was discovered by Ernest Rutherford in 1911. Rutherford conducted the gold foil experiment which led to the discovery of the atomic nucleus, later identified as the proton.
04

Discovery of Neutron

The neutron was discovered by James Chadwick in 1932. He observed that when beryllium was bombarded with alpha particles, it produced a neutral particle that had approximately the same mass as a proton.
05

Comparing the Years

Now we can compare the years these subatomic particles were discovered: - Electron: 1897 - Proton: 1911 - Neutron: 1932
06

Answer

Based on the historical records, the electron was discovered first, and the neutron was discovered last.

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