Ionic Bonding and Ionic Compounds 6.3

In covalent bonds, bonds are made by _______ electrons. Covalent Compounds In covalent bonds, bonds are made by _______ electrons. We use ______ _____________ to depict them. In ionic bonds, bonds are made by ___________ electrons.

Ionic Compounds Ionic Compounds – composed of + and – ions that are combined so that the # of + charges = # of – charges Most exist as crystalline solids + and – ions that r attracted Can’t examine individual units like u can in a molecular cmpd

Ionic Compounds Formula represents simplest ratio that gives electric neutrality Formula unit – the simplest collection of atoms from which an ionic compound’s formula can be established

Formation of Ionic Cmpds . .. Na. + :Cl:  Na+ + :Cl:- In ionic cmpds, to decrease potential E, they combine in an orderly arrangement – crystal lattice Lattice Energy – the E released when 1 mole of an ionic crystalline cmpd is formed from gaseous ions .. ..

NaCl Crystal Lattice

Compare Ionic and Molecular Cmpds (In General) Ionic bonds r stronger than covalent Ionic cmpds melt and boil at higher temps Ionic cmpds are hard b/c in layers In molten state ionic cmpds conduct electricity

A charged group of covalently bonded atoms Polyatomic Ions A charged group of covalently bonded atoms Bond to other ions ionically You will have to memorize several polys including the name, formula, and the charge!

Please complete the section review on page 194 and do numbers 1-5. Assignment Slide Please complete the section review on page 194 and do numbers 1-5.