Question

What did Thomson’s model of the atom include that Dalton’s model did not have?

a nucleus
energy levels
electron clouds
smaller particles

Answer 1

Thomson’s model of the atom included **smaller particles** (specifically electrons) that Dalton’s model did not have. Dalton's model considered the atom to be the smallest indivisible unit of matter, while Thomson's model introduced the idea of electrons embedded within a positively charged "soup," leading to the concept of smaller constituents within the atom.