Answer:
the individual atom in the molecule
Explanation:
In chemistry, the ball-and-stick model is a molecular model of a chemical substance. Invidual spheres there represent atoms in the molecule. The bigger atomic number the atom has, the larger diameter of the spheres this atom has in this model.
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Boiling Water is a physical change. When water gets to a certain temperature, it's boiling point starts.
Diamond and graphite are made of carbon. So is most of charcoal.
