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Prepare a 350- to 700-word paper in which you describe the periodic nature and properties of atoms and molecules.

Explain at a level of detail Dmitri Mendeleev would have understood how halogens and alkali metals are extremely reactive, whereas noble gases are not reactive.

Compare properties of molecules formed from atoms in similar families; for example, H2S versus H2O.

Explain what is meant by the electronic structure of atoms. How does knowing the electronic structure of atoms aid chemists in predicting chemical reactions?

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