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1. Include a nonmetal (Carbon), Two metalloids (Silicon and Germanium), and two metals (Tin and Lead).

2. Vary greatly in both physical and chemical properties.

3. Occur in nature in both combined and elemental forms.

4. Consist of atoms that contain four electrons in the outermost energy level.

5. Are relatively unreactive.

6. Tend to form covalent compounds (Tin and Lead also form ionic compounds).

7. They all become solid at room temperature.

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