What is an atom? How and when was it discovered?

1 Answer
Jan 14, 2018

Atoms are the basic units of matter and the defining structure of elements.


Atoms are made up of three particles: protons, neutrons and electrons. Thompson discovered the electron in 1897, which led him to posit a “plum pudding” model (a.k.a. the “raisin pudding” model) for the atom.