1. Dalton’s Atomic Theory
BY: Ali, Steph, Hunter, Victoria

2. Who is John Dalton? English Teacher Chemist in the early 1800’s
Identified the hereditary nature of red-green color blindness
Revealed concept of Partial Pressures
Credited as the father of modern atomic theory

3. What are the 5 key points of his theory?
1. Elements are made of extremely small particles called atoms.
2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.

4. Experiments
Dalton used symbols to represent the elements. He imagined atoms to be tiny spheres, thus to draw atoms would be to draw circles.
He used patterns within the circles to distinguish the different elements.

5. Theory in science timeline
Created in 1803
Dalton created his theory near the beginning of the science timeline
Allowing other scientist to build on Daltons theory.

6. How did it hold? Many other chemists built off of his theory
His theory is pretty close to what we know about atoms today.
We know that atoms are small particles, they can’t be created or destroyed, they have chemical reactions, and they form chemical compounds. Dalton was the one who has discovered this.