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Warm Up

Warm Up. Name the following compound Cl0 2 Give the following formula 2. Disilicon Hexafluoride 3. Carbon tetrachloride. Covalent Compounds: Writing Lewis Dot Structures. What are the atoms trying to achieve? Octet rule = atoms want 8 electrons in their valence shell. Exception #1:

raphael-bernard
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Warm Up

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  1. Warm Up • Name the following compound • Cl02 • Give the following formula 2. Disilicon Hexafluoride 3. Carbon tetrachloride

  2. Covalent Compounds:Writing Lewis Dot Structures

  3. What are the atoms trying to achieve?Octet rule = atoms want 8 electrons in their valence shell Exception #1: Hydrogen and Helium only want 2

  4. . . H H : H H Covalent Bonding in H2 Two hydrogen atoms, each with 1 electron, can share those electrons in a covalent bond. • Sharing the electron pair gives each hydrogen an electron configuration analogous to helium.

  5. .. .. . . : : F F .. .. .. .. : : : F F .. .. Covalent Bonding in F2 Two fluorine atoms, each with 7 valence electrons, can share those electrons in a covalent bond. • Sharing the electron pair gives each fluorine an electron configuration analogous to neon.

  6. . .. . . . : C F .. . .. : : F .. .. .. : : : F C : F .. .. .. : : F .. Example Combine carbon (4 valence electrons) andfour fluorines (7 valence electrons each) to write a Lewis structure for CF4. The octet rule is satisfied for carbon and each fluorine.

  7. .. : : F .. .. .. : : : F C : F .. .. .. : : F .. : : F .. .. : : C F F .. .. : : F .. Example It is common practice to represent a covalentbond by a line. We can rewrite .. as

  8. So… 2 shared electrons can be rewritten as a single line. The line is called a ‘single bond’. • TRY IT!! • Draw the lewis dot structure for Phosphorus Triiodide • Draw it again, this time replacing pairs of shared electrons with a single line.

  9. Phosphorus Triiodide : I : : . : : : : : . : : I I P . . : : : : I : _ _ : : : I I . . P _ : :

  10. .. .. : : : : : : C O O Double bonds • Some atoms share more than 2 pairs of electrons between them. • You still replace each pair of shared electrons with a line but if two lines are present between 2 atoms, it is called a DOUBLE BOND. Try drawing the double bonds for carbon dioxide Carbon dioxide

  11. .. .. .. .. : : : : : : : : C C O O O O becomes

  12. : : : : : : H H C N C N Triple Bonds Hydrogen cyanide

  13. REMEMBER… • The atoms want to have 8 valence electrons! • Shared electron pairs can be represented by a line, which shows that the atoms are bonded.

  14. H H .. .. : : : : H H C C : : : : : H H C C Let’s practice! Replace the electron pairs by drawing in the bonds Ethylene Acetylene

  15. H H H H .. .. : : : : H H C C C C H H : : : : : H H H H C C C C Ethylene Acetylene

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