Which event would be impossible to explain by using John Dalton’s model of the atom?

Dalton’s model described atoms as indivisible particles, so it could not explain an iron atom emitting smaller particles when struck by light. That event involves particles or energy being released from within an atom, which requires a model with internal atomic structure. The other choices describe chemical reactions, which Dalton’s model could explain as atoms rearranging into new combinations.

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