Chapter Sixteen: Compounds  16.1 Chemical Bonds  16.2 Chemical Formulas  16.3 Molecules.

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Presentation transcript:

Chapter Sixteen: Compounds  16.1 Chemical Bonds  16.2 Chemical Formulas  16.3 Molecules

CHEMICAL BONDING  Occurs when 2 or more atoms combine  Can be from the same element (O 2 ) or different elements (NaCl)  Atoms combine so that they each have a total of 8 valence electrons (full octet)

16.1 Valence electrons  Chemical bonds are formed only between the electrons in the highest unfilled energy level.  These electrons are called valence electrons.

16.1 Valence electrons and the periodic table  Going from left to right across a period each new element has one more valence electron than the one before it (A group). How many valence electrons does nitrogen have?

16.1 Lewis dot diagrams  A clever way to keep track of valence electrons is to draw Lewis dot diagrams.  A dot diagram shows the element symbol surrounded by one to eight dots representing the valence electrons. What is the dot structure for nitrogen?