Question

John Dalton believed which of the following about atoms?

Atoms are real even though they're invisible.
All atoms of a single substance are identical.
The atom could be divided into smaller parts.
Atoms of different substances differ by weight.

Answer 1

1,2, and 3

It is all three

Answer 2

Dalton's Atomic Theory
1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.