Question

question 2 of 10
how did thomsons experiment change daltons atomic model?
a. thomson discovered that the atom contained smaller particles called electrons.
b. thomson discovered that atoms did not rearrange when forming compounds.
c. thomson discovered that atoms changed properties when put in an electric field.
d. thomson discovered that atoms of one kind of element could have different masses.

Explanation:

Dalton's atomic model proposed that atoms are indivisible. Thomson's cathode - ray tube experiment led to the discovery of electrons. Electrons are smaller particles within the atom. Option B is incorrect as atoms do rearrange when forming compounds. Option C is not the key change to Dalton's model. Option D is related to isotopes (not Thomson's main contribution to changing Dalton's model).

Answer:

A. Thomson discovered that the atom contained smaller particles called electrons.