Relationship between boiling temperature and vapour pressure

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?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?