BELLWORK 12/07/15 Draw the Lewis Structure for NH3 using lines for the shared electron pairs. Draw the Lewis Structure for CO2 Draw the Lewis Structure for CO2?

Double Covalent Bonds Sometimes atoms attain noble gas configuration by sharing 2 or 3 pairs of electrons A Double Covalent Bond is a bond that involves 2 shared pairs of electrons (4 e-)

Triple Covalent Bond A Triple Covalent Bond is a bond that involves 3 shared pairs of electrons (6 e-)

7.3 Naming Covalent Compounds and Writing Formulas

Naming Covalent Compounds The system of naming covalent compounds is based on the use of prefixes.

Prefixes-stand for the amount of atoms present 1-- mono 2-- di 3-- tri 4-- tetra 5-- penta 6-- hexa 7-- hepta 8-- octa 9-- nona 10-- deca

2 Steps to Naming and Writing Molecular Compounds with Covalent Bonds Name the first non-metal. The first non-metal only gets a prefix if there is more than one atom. Name the second non-metal using the correct prefix and an “ide” ending *The second non-metal always receives a prefix.

EXAMPLES CO2 – carbon dioxide N2O5 – Dinitrogen pentoxide

You try . . . Cl2O Dichlorine monoxide

Carbon Monoxide CO Phosphorus Trichloride PCl3 CI4 Carbon Tetriodide

Writing The Molecular Formulas: Phosphorous Trichloride PCl3

Trinitrogen N3 Carbon Tetrachloride CCl4

Classwork / Homework Covalent Wksht #3