What is the billiard ball model?
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The Billiard Ball model of the atom was proposed by John Dalton in the early 1800s. He thought atoms were small, hard spheres with no internal parts. Dalton knew that atoms could combine and recombine with each other in whole number ratios to form compounds.
Dalton’s Model of an Atom
It is often referred to as the billiard ball model. He defined an atom to be a ball-like structure, as the concepts of atomic nucleus and electrons were unknown at the time.