Question

Which best describes a way that an experiment contradicted an existing model of the atom? Select one: A. Thomson showed that neutrons must be located in the center of an atom. B. Rutherford showed that the atom must have a nucleus. C. Bohr showed that atoms must contain negative charges. D. Chadwick showed that atoms cannot contain neutral particles.

Answer 1

Answer: Option (D) is the correct answer.

Explanation:

Existing model of atom shows that an atom contains neutrons, protons and electrons.

Protons (have positive charge) and neutrons (no charge) reside into the nucleus and nucleus is located at the center of atom.

Whereas electrons revolve around the nucleus. Neutrons are the neutral particles present in an atom as they do not have any charge.

Therefore, out of the given options, an experiment that contradicted an existing model of the atom is described as Chadwick showed that atoms cannot contain neutral particles.

Answer 2

D. Chadwick showed that atoms cannot contain neutral particles.

Atoms do in fact contain neutrons in their nuclei.