Question

discovered the presence of neutral particle inside the atom.​

Answer 1

Explanation:

The story begins in 1932, with the discovery of the neutron by Sir James Chadwick, an English physicist. Until 1932, the atom was known to consist of a positively charged nucleus surrounded by enough negatively charged electrons to make the atom electrically neutral.

Answer 2

By 1920, physicists knew that most of the mass of the atom was locatedin a nucleus at its center, and that this central core contained protons.In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Chadwick was born in1891 inManchester, England.

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