what new characteristic did john dalton add to the model of the atom? an atom is a round, solid mass. an…

Brief Explanations:

John Dalton's atomic theory proposed that atoms are the smallest units of matter and that atoms of different elements combine in simple whole - number ratios to form compounds. He also stated that atoms can join with other kinds of atoms. The idea of an atom being a round, solid mass was part of his model but not a new characteristic compared to earlier basic concepts. The idea of a massive, positive center was proposed by Rutherford. The idea that an atom is made up of smaller particles came later with the discovery of electrons, protons, and neutrons. Dalton's key new addition was the concept of atoms combining with other atoms.

Answer:

An atom can join with other kinds of atoms.