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The models that scientists develop take many different forms. In some cases they are actual physical constructions. A good example of this kind of model would be one that represents the Earth, moon, and sun as small wooden spheres that are mechanically moved in such a way as to illustrate the phases of the moon, eclipses, and so forth (see Figure 1). Other models may be nothing more than mental images that are developed in an effort to picture something unseen. A good example would be the Bohr solar system model of the atom that is often used by beginning chemistry students. In this model the nucleus is imagined to be like the sun and the electrons are visualized as whirling around the nucleus analogous to the planets orbiting the sun (see Figure 2)...
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