Activity B (continued from previous page) Count : Review the Lewis diagrams you drew on the previous page. Note that each element tends to form a...

Make a rule: If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element? (Hint: Ignore hydrogen for now.)

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Analyze: The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen?

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Apply: Selenium has six valence electrons. What is the valence of selenium? ___________

Think and discuss: The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

Why don’t these gases tend to form chemical bonds? ______________________________

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