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BONDING TYPES ctnd .

BONDING TYPES ctnd . What is covalent bonding? What is metallic bonding? How do you name or write covalent compounds?. BONDING TYPES. Ionic  stealing, transfer of electrons Covalent  sharing of electrons

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BONDING TYPES ctnd .

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  1. BONDING TYPES ctnd. What is covalent bonding? What is metallic bonding? How do you name or write covalent compounds?

  2. BONDING TYPES • Ionic  stealing, transfer of electrons • Covalent  sharing of electrons • Metallic bonds are attractions of floating valence e- to other positively charged cations (Sea of electrons, drifter) Watch Video: Common Types of Atomic Bonds http://aaronfreeman.wikispaces.com/file/view/Common_Types_of_Atomic_Bonds.mov

  3. Ionic or Covalent? • How can I easily determine if a substance is ionic or covalent? • By calculating difference in electronegativity! • Rule of Thumb – Magic Number = 1.67 • If the difference is > 1.67 IONIC < 1.67 COVALENT = 1.67 50% Ionic and 50% Covalent

  4. ELECTRONEGATIVITY VALUES

  5. EXAMPLES • EX. Examine electronegativity between F and Cs F = 4.0 Cs = .7 |4.0 - .7| = 3.3 so …. IONIC COMPOUND Practice • Ca and Cl Ca = 1.0 Cl = 3.0 • Difference is 2.0 so Ionic Compound • S and O S = 2.5 O = 3.5 • Difference is 1 so Covalent Compound

  6. COVALENT COMPOUNDS • Molecules neutral group of atoms held together by covalent bonds • Molecular/Covalent Compounds compound whose simplest units are molecules • Low melting/boiling points • Made from two nonmetals • EX. H2O water CO2 carbon monoxide

  7. MOLECULES

  8. MOLECULAR FORMULA • Molecular Formula chemical formula of covalent cmpd • Actual number of atoms in each molecule • Does NOT tell us about arrangement of atoms • H2O : 2 atoms of H 1 atom of O • C2H6 : 2 atoms of C 6 atoms of H

  9. NAMING MOLECULAR COMPOUNDS • DO NOT USE CHARGES!!!! • USE PREFIXES AND SUFFIXES  tells how many atoms of each element are present in each molecule of the compound • How would you name? CO2 or SO3 Carbon Dioxide Sulfur Trioxide

  10. NAMING MOLECULAR COMPOUNDS If covalent: use prefixes • OMIT the prefix mono- if the first atom is = 1 p.269 • ADD suffix to the second element of –ide • SF6 • Cl2O8 • SO3 • ICl4 • P2O5 • Carbon Tetraiodide • Phosphorus Trichloride • DinitrogenTrioxide • Br2 I2 O2 Sulfur Hexafluoride DichlorineOctoxygen …. NOT Octa-oxygen Sulfur Trioxide Iodine Tetrachloride DiphosphorusPentoxide … NOT Penta-oxide CI4 PCl3 N2O3 Oxygen Bromine Iodine

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