John Dalton

Lauren, Kellie, Bella, Jocelyn

Time Period:

1766-1844; Was the first modern day scientist to reintroduce discussion of the atom.

John Dalton's 5 Ideas About Atoms:

1. He discovered that elements are made of extremely small particles called atoms.

2. All atoms of a given element are identical.

3. Atoms cannot be subdivided, created, or destroyed.

4. Atoms of different elements form compounds from chemical reactions.

5. In chemical reactions atoms are combined, separated, or rearranged.

What 2 Things Were Wrong With His Theory?

His Theory:

1. Atoms are indestructible/unchangeable.

2. Atoms are characterized by their mass.


How It Is Now:

1. Atoms are destructible and changeable.

2. Atoms of the same element, can vary in mass because of isotopes.