Question

PLS HELP!! ASAP!! 10 POINTS!!

From Dalton's atomic theory, a few parts were disproven over the course of years of experiments. Which part was modified by the discovery of subatomic particles?

That matter is made of atoms.
If the same elements are in a two different compounds, their ratio will always be the smallest whole number ratio for that compound.
That atoms cannot be divided.
That all atoms of an element are exactly the same

Answer 1

The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. ... According to Dalton, the atoms of same element are similar in all respects. However, atoms of some elements vary in their masses and densities. These atoms of different masses are called isotopes.