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A firm grasp of the basic ideas of division of matter is important for the understanding of physical sciences. These basic ideas presented here are not only used in chemistry and physics, but in many diverse fields such as medicine, engineering, astronomy, geology, and so on. In this chapter, we will discuss ideas about atoms and molecules, and related aspects such as moles, Avogadro number, percentage composition, atomic mass, atomic weight, and subatomic particles.

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