Weegy: Dalton's model did not recognize that atoms of different elements have different masses.
Thomson's experiments were significant in that they questioned
A. whether matter is made up of atoms.
B. whether the atom has a positive or negative charge.
C. whether atoms will form compounds with other atoms.
D. whether the atom could be broken up into smaller units. Weegy: D. whether the atom could be broken up into smaller units. ... (More)