Good morning class. Today we are going to be examining atomic models, discoveries in atoms, and the scientists who conducted experiments leading to these discoveries. The very first person to propose the existence of an atom was a man named Democritus. His studies intrigued others many years later and they began proving the presence of atoms.
To start, lets look at some early atomic models. This specific example is from a scientist named John Dalton. His atomic theory proposed that all matter is made up of atoms.
You see all matter, meaning this desk, the whiteboard, and you and I are all made up of atoms. Atoms are very small particles and cannot be broken down. Each is composed of a positive nucleus and surrounded by negative electrons. Lets look more into this idea.
The next revolutionizing discovery is the discovery of electrons. This discovery was contributed to by the likes of J.J Thomson and Robert Millikan. They performed electric discharge experiments that led to proof that atoms are made of a nucleus and electrons.
The final scientist we will talk about is Ernest Rutherford. He established the nuclear theory of the atom with his gold-foil experiment. He shot a beam of alpha particles at a sheet of gold foil and some of these particles deflected. That is all. See you tomorrow everyone.
How was school? That is really cool. Glad that you had a great day.
Hey mom. School was pretty good. In science class today the teacher talked about the theory of atoms and the really smart scientists who discovered them.