Question

choose all the correct observations and conclusions of john dalton. electrons circled the nucleus of the atom common substances always broke down into the same elements in the same proportions various compounds were combinations of atoms of different elements atoms could not be created nor destroyed protons has a positive charge

Explanation:

John Dalton's atomic theory included the ideas that common substances break down into the same elements in the same proportions, compounds are combinations of atoms of different elements, and atoms cannot be created or destroyed. The idea of electrons circling the nucleus was part of later models (like Bohr's model), and the discovery of protons and their charge was also later.

Answer:

• Common substances always broke down into the same elements in the same proportions
• various compounds were combinations of atoms of different elements
• atoms could not be created nor destroyed