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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.

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Answers:

Nuclear reactions can change an atom of one element into an atom of another element. ( fourth choice)

Atoms contain smaller particles: protons, neutrons, and electrons.( first choice)

Atoms of a given element can have different numbers of neutrons.( third choice)

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Answer:

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

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.

Explanation:

Electrons, protons, and neutrons, and isotopes had not yet been discovered.

The only statement that agrees with Dalton's atomic theory is  

B. Atoms of a given element can bond to other atoms only in specific ways. Dalton used this postulate to formulate the Laws of Definite Composition and of Multiple Proportions.