A. Dalton - John Dalton created the very first atomic theory. Dalton viewed atoms as tiny, solid balls. His atomic theory had 4 statements: 1. Atoms are tiny, invisible particles. 2. Atoms of one element are all the same. 3. Atoms of different elements are different. 4. Compounds form by combining atoms.
B. Thomson - Thompson believed atoms were made mostly out of (+) charged material, like dough in a bun. The (-) charged electrons are found inside the (+) dough.
C. Rutherford - Rutherford discovered protons and the nucleus. He showed that atoms have (+) particles in the center, and are mostly empty space. He called these (+) particles protons. He called the center of atoms the nucleus.
