Question

Describe the major contribution of Dalton's atomic theory to the understanding of atomic structure. A) Electrons can only be located in circular, concentric shells. B) Chemical elements are made up of identical units called atoms. C) Discovery of the existence, location, and charge of the nucleus. D) The determination of the identity of the three subatomic particles.

Answer 1

John Dalton (1766 - 1844) was an English chemist who is primarily known for his atomic theory, which although it is about two centuries old and has progressed in the meantime, is still valid. According to his theory, all elements, matter, are made of atoms, and that all atoms in the given element have the same mass and property, while the compounds are formed from several different types of atoms, where the chemical reaction of two or more elements represents the rearrangement of atoms.

The answer is: B)

Answer 2

1 all atoms are indivisible and indestructible