Elements, Compounds, and Mixtures — Unit test

Question 7 • SVHS Chemistry 1 $FA

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

Answer

The modern model is not as widely accepted by scientists as Dalton’s model.

The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.

The modern model recognizes particles in the atom, whereas Dalton’s model does not.

The modern model does not explain emission spectra, whereas Dalton’s model does.

Explanation

Dalton described atoms as indivisible, solid particles, without smaller parts. The modern quantum model recognizes subatomic particles, including protons, neutrons, and electrons, so choice C is correct. The other choices reverse the models’ features: modern atomic theory is widely accepted, atoms of different elements are not all identical, and quantum theory helps explain emission spectra.

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