Question

what did john dalton contribute to the understanding of the atom?

a. an article disproving aristotles ideas

b. an early form of the atomic theory

c. a theory of quantum mechanics

d. an early form of the periodic table

Explanation:

John Dalton is known for developing an early form of atomic theory. Option A is incorrect as he didn't focus on disproving Aristotle's ideas. Option C is wrong because quantum mechanics was developed later by other scientists. Option D is incorrect as the periodic table was developed by Mendeleev, not Dalton.

Answer:

B. An early form of the atomic theory