What was one idea Dalton taught about atoms?

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which of the following units is not an official si unit? mole liter kilogram ampere