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Lecture 8A - Formation of Covalent (Molecular) Compounds

Lecture 8A - Formation of Covalent (Molecular) Compounds. I. Covalent Bonds. A. These bonds are formed from two atoms _________ electrons, so each atom will have a filled outer energy level. sharing. 1 dash represents 2 electrons. A bond is drawn as a dash:.

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Lecture 8A - Formation of Covalent (Molecular) Compounds

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  1. Lecture 8A - Formation of Covalent (Molecular) Compounds

  2. I. Covalent Bonds A. These bonds are formed from twoatoms _________ electrons, so each atom will have a filled outer energy level. sharing 1 dash represents 2 electrons A bond is drawn as a dash:  This is called a Structural Formula B. Three types of bonds can be formed: 1 pair of electrons are shared between 2 atoms, 2e- total Single - 2 pairs of electrons are shared between 2 atoms, 4e- total Double - 3 pairs of electrons are shared between 2 atoms, 6e- total Triple -

  3. II. Bond Formation A. Covalent bonds are formed from two or more ______________ ONLY, which are found in groups: nonmetals 4A-7A • The sharing of e- will allow each atom to achieve a stable noble gas e- configuration. • Each atom will have 8 valence electrons or a full octet creating filled orbitals. Exception: Cl Cl H H Stable configuration Circle the shared electrons

  4. III. Review Ionic Compounds vs. Covalent Compounds Ionic Bonds Covalent Bonds Anion & cation 2 or more nonmetals Transfer e-: Arrow is used Share e-: Draw a line to show shared e- between the2 atoms Chemical Formula = Formula Unit Chemical Formula = Molecular formula A line is notused to represent a bond, why? A line is used to represent a bond, why? Share e- Don’t share e-

  5. Covalent Bonds two atoms share e- One pair of electrons Two pairs of electrons Three pairs of electrons called called called Single bond Double bond Triple bond Drawing covalent molecules takes practice & patience! Practice makes perfect!

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