Question

In 1803, the British chemist John Dalton proposed several atomic theories. Which one of his theories was later shown to be incorrect?

I. Atoms are indivisible and indestructible particles.

II. All atoms of the same element are exactly alike.

III. Atoms of different elements are different.

IV. Atoms combine in specific numerical ratios to form compounds.

A. II only
B. II & III only
C. I & II only

Answer 1

Option C: I and II only.

The atoms have subparticles and the isotops are atoms of the same element that differ in the number of neutrons.