Question

Which of the following was not a feature of John Dalton's atomic research?

a) Mass ratios of elements involved in chemical reactions
b) Experiments that refined and supported his hypothesis
c) Careful observations and measurements
d) Discovery of the atom's internal structure

Answer 1

John Dalton's research did not include the discovery of the atom's internal structure; his work focused on mass ratios and experimental evidence for his atomic theory. Correct option is d)

Step-by-step explanation:

John Dalton's atomic research did not include the discovery of the atom's internal structure. The essential features of his research were mass ratios of elements, which explained how elements combine in fixed proportions by mass, supporting the law of definite proportions, and experimental evidence that substantiated his modern atomic theory. Dalton's atomic theory focused on the weights of elements and compounds in various combinations, the qualitative and quantitative relationships in chemical reactions, and proposed that all elements are composed of atoms. However, the detailed internal structure of these atoms was not characterized by Dalton; that discovery came later with advancements in the field of atomic physics.