Question

sub atomic particles discovered by Chadwick ________ ? ​

Answer 1

neutron

By 1920, physicists knew that most of the mass of the atom was located in 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.

Hope it will helps you☺

Answer 2

$\huge\underline{\overline{\mid{\bold{\red{☨ AnsweR ☨}}\mid}}}$

☛ Neutron

In 1932 English physicist James Chadwick (1891–1974) discovered another matter particle, the neutron. The neutron is very similar to the proton except that it is electrically neutral (i.e., has no charge). Chadwick found the neutron by hitting a chemical called beryllium with alpha particles.

$\sf\colorbox{lime}{✯ mark - me - as - brainliest ✯}$