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Covalent Bonding.

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Presentation on theme: "Covalent Bonding."— Presentation transcript:

1 Covalent Bonding

2 COVALENT BONDS Formed when atoms combine to form molecules by sharing one or more outer electrons. Commonly identified by being two non-metals.

3 ALL elemental gases form diatomic molecules
H Hydrogen H2 Fluorine F F2 Text and graphics by Erica Williams. Copyright © 2007, Erica Williams.

4 Other common gases Ammonia NH3 Carbon dioxide CO2 Methane CH4
Text and graphics by Erica Williams. Copyright © 2007, Erica Williams.

5 Liquids Carbon tetrafluoride CF4 Methyl alcohol CH3OH
Text and graphics by Erica Williams. Copyright © 2007, Erica Williams.

6 Naming Covalent Compounds
We use the naming system for compounds. The prefix naming system tells us how many of each atom is combined in the formula. For example: CCl4= Carbon tetrachloride P2O5= Diphosphorus pentoxide

7 Prefix Number of Atoms mon(o) 1 di 2 tri 3 tetra 4 penta 5 hexa 6 hepta 7 octa 8 nona 9 deca 10

8 Rules to follow: 1. Most left element is written first.
2. Prefix is placed before the element’s name. 3. If there is only 1 of the first element, we do not write the mono . Eg. CO, simply write carbon… 4. Write the name of the second element with the appropriate prefix that shows number of atoms are present in that compound. Eg. CO becomes carbon monoxide

9 Diatoms All elemental gases form diatomic molecules. Diatomic molecules are composed of only atom. Hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (Cl2), Bromine (Br2) and Iodine (I2) These molecules are found as a single atom, all by itself.

10 The Diatomic 7

11 Other examples: CS2 = carbon disulphide SO3= Sulphur trioxide
CCl4= Carbon tetrachloride P2O5= Diphosphorus pentoxide

12 Checking Understanding
Sulphur dioxide Carbon monoxide Barium hexasulphide Vanadium tribromide Tungsten hexafluoride Cobalt disilicide Tetrasulphur dinitride Iodine heptafluoride SO2 CO BaS6 VBr3 WF6 CoSi2 S4N2 IF7 PCl5 MoS4 SbI5 Si2I6 Br3O8 MnF2 SnBr2I2 S3N2O2 Phosphorous pentachloride Molybdenum tetrasulphide Antimony pentaiodide Disilicon hexaiodide Tribromine octoxide Manganese difluoride Tin dibromide diiodide Trisulphur dinitride dioxide

13 The End

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