Dalton and Daltons Atomic Theory

What idea in Daltons atomic theory talks about what elements are composed of?

1. All elements are composed of tiny indivisible particles called atoms

What idea in Daltons atomic theory talks about atoms of the same element?

2. Atoms of the same element are identical. The atoms of any one element are different from those of any other element

What idea in Daltons atomic theory talks about elements mixing together?

3. Atoms of different elements can physically mix together or can chemically combine with one another in simple whole number ratios to form compounds

What idea in Daltons atomic theory talks about chemical reactions?

4. Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction

What is one important change in Daltons atomic theory?

We now know that atoms are divisible

Who discovered electrons?

Thomson