CHEMISTRYIonic Bonds and
Compounds
Section 7 Definitions Ionic Compound Ionic Bond Chemical Formula Formula Unit
Forming Ionic Compounds IONIC COMPOUND:
Compounds composed of cations and anions Usually metal cation
and nonmetal anion Ionic compounds are
electrically neutral
The positive cation attracts the negative anion IONIC BONDS: The electrostatic force that
holds ionic compounds together Na has one v.e. and Cl has 7 v.e.
When they form a compound, Na gives up it’s one v.e. to Cl, forming Na +; Cl gained that v.e., becoming Cl -
Combine in 1:1 ratio Na + Cl = NaCl
Ex.: Li + Br
The chemical formula of an ionic compound shows the lowest amount of ions needed to make a “balanced or neutral” compound
This is called a FORMULA UNIT The smallest whole-
number ratio of ions in a formula
Ionic compounds are not separate things like molecules but continuous arrays of ions
Ionic Compound Properties Most are crystalline solids at room temp Crystals have repeating, 3-dimensional patterns When dissolved in water, ionic compounds
break up into cations and anions Water molecules keep them apart
Typically have high melting points due to strong attractive forces
Ionic compounds conduct electricity when dissolved in water Used as electrolytes
Assignment
Ionic Compounds Worksheet Name to Formula Ionic Compounds
Worksheet