It is a story of how ideas changed about the nature of the atom. These are the notes (and diagrams) I use when I teach the atomic nature of matter to non-science majors. The best thing about this ...

Thomson’s Model of Atom (by Joseph James Thomson in 1897) Thomson’s model of an atom proposed that: → An atom is a uniform sphere of positive charges (due to presence of protons) as well as ...

Save guides, add subjects and pick up where you left off with your BBC account. Most of the mass and all of the positive charge of an atom is in the nucleus. Most of an atom is empty space, (a ...