Question

Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.

Atoms contain smaller particles: protons, neutrons, and electrons.

Atoms of a given element can bond to other atoms only in specific ways.

Atoms of a given element can have different numbers of neutrons.

Nuclear reactions can change an atom of one element into an atom of another element.

All atoms of a given element have the same number of protons.

Answer 1

A. Atoms contain smaller particles: protons, neutrons, and electrons.

C Atoms of a given element can have different numbers of neutrons.

D. Nuclear reactions can change an atom of one element into an atom of another element.

Step-by-step explanation:

According to Dalton's atomic theory, atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed.

So choices A, C, D contradict Dalton's atomic theory.