Describe how scientific ideas about the atom changed over time.

In the Early 1800s, John Dalton stated that matter is tiny particles called atoms that are indivisible. Some materials were only made of one kind of atom called an element. Two atoms of hydrogen combined with one atom of oxygen would form one molecule of water.
Then, in 1897, J.J Thompson proposed that repetitively charged particles inside of the atom were part of every atom. And those were called electrons. They called Thomson's work "Plum Pudding." Sadly, "Plum Pudding" didn't last very long.
Rutherford concluded there was a center of a positive charge within the atom called protons. Atoms contained one proton for each electron.

P.rotons- Positively electric charged
E.lectrons- Negative electricity
N.eutrons- about the same mass as a proton, but with no electric charge.

P.E.N

I hoped this helped :)