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Answer:
Dalton hypothesized that the law of conservation of mass and the law of definite proportions could be explained using the idea of atoms. He proposed that all matter is made of tiny indivisible particles called atoms, which he imagined as "solid, massy, hard, impenetrable, movable particle(s)"
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Explanation:
It is called atomic theory because it explains observations and changes from time to time.
In science, a theory is a logical explanation that tries to demonstrate the reason behind diverse scientific observations. A scientific theory changes based on emerging evidence.
A scientific law is a principle that has been demonstrated and proven to be true beyond reasonable doubts and without exceptions. Since the atomic theory changes from time to time based on emerging evidence, it is a theory and not a law.
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