When was the proton first identified as a distinct particle?
Quick Answer
Around 1917–1919, Ernest Rutherford identified the proton as the hydrogen nucleus in nuclear reactions. It became recognized as a fundamental particle of positive charge.
The Full Story
Ernest Rutherford identified the proton as a distinct particle in the late 1910s, especially through experiments around 1917 to 1919. He showed that the hydrogen nucleus appeared in nuclear reactions and represented a basic unit of positive charge. This discovery was foundational for nuclear physics and the later understanding of atomic structure. The proton remains one of the two main particles in atomic nuclei.
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