Which event would be impossible to explain by using John Dalton's model of the atom?
O An iron atom emits particles when it is struck by light.
O An oxygen atom combines with two hydrogen atoms to form water.
O An acid reacts with a base to form salt and water.
O The atoms in sodium metal react with water.

John Dalton's atomic model explains the atom to be the indivisible particle. An iron atom emitting particles is impossible to explain by Dalton's atomic model. Thus, option A is correct.

What is Dalton's model of the atom?

Dalton gave the atomic theory and proposed that matters are made of atoms that are indivisible particles and cannot be penetrated. The models were based on the law of conservation of mass and various proportions.

The model was a failure as it was later discovered that sub-atomic particles are the units that make the atoms. The emission of the particles from the iron atom would not have been possible to be explained through Dalton's model as it didn't consider the sub-atomic particles.

Therefore, the emission from atoms cannot be explained by Dalton's model.

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