8. Approximately how many elements are necessary to form all the solids, liquids, and gases around us?
9. Imagine you have four different chemical elements in your chemical laboratory. What is the maximum number of 1:1 chemical compounds that you could form? What if you had 12 different chemical elements?
10. Using the periodic table, calculate the result of the following: the number of electrons in the outer shell (valence) of a hydrogen atom minus the number of electrons in the outer shell (valence) of a helium atom plus the number of electrons in the out shell (valence) of a hydrogen atom.
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