Vocabulary & Writing/Naming Ionic Formulas
Ionic bond
A chemical bond in which a metal atom loses an electron to form a positive cation and a nonmetal atom gains an electron to form a negative ion
Coefficient
A whole number that appears in front of the formula and chemical equation indicates the number of moles
Formula for Aluminum oxide
Al2O3
Formula for Aluminum bromide
AlBr₃
Formula for Aluminum fluoride
AlF₃
Name this compound -Al₂S₃
Aluminum sulfide
Formula for aluminum sulfide
Al₂S₃
Ion
Atom with a charge
Formula for Barium fluoride
BaF₂
Formula for Barium oxide
BaO
Formula for Calcium bromide
CaBr₂
Formula for Calcium chloride
CaCl₂
Formula for Calcium sulfide
CaS
Name this compound -Ca3N2
Calcium nitride
Formula for calcium nitride
Ca₃N₂
Name this compound -CsCl
Cesium chloride
Formula for Potassium iodide
KI
Formula for potassium oxide
K₂O
Formula for Potassium sulfide
K₂S
Formula for potassium nitride
K₃N
Formula for lithium bromide
LiBr
Name this compound -Li₂O
Lithium oxide
Formula for lithium sulfide
Li₂S
Name this compound -MgO
Magnesium oxide
Formula for Magnesium chloride
MgCl₂
Formula for magnesium fluoride
MgF₂
Formula for Magnesium sulfide
MgS
Formula for nitrogen dioxide
NO₂
Formula for Sodium fluoride
NaF
Formula for Sodium iodide
NaI
Formula for Sodium sulfide
Na₂S
Formula for Sodium nitride
Na₃N
Anion
Negatively charged ion results from gain of electrons nonmetals only
Formula for phosphorous trichloride
PCl₃
Cation
Positively positively charged ion. results from loss of electrons. Metals only
Name this compound -K₃N
Potassium nitride
Name this compound -Ag₃N
Silver nitride
Name this compound -Ag₂O
Silver oxide
Subscript
Small numbers to the lower right of the symbol they represent the number of Adams of the element in the compound
Name this compound -NaBr
Sodium bromide
Naming ionic compounds
Write the name of cation first. Write name of anion last, followed by "ide".
The Criss-Cross Rule
a way to write the formula for an ionic compound in the lowest whole number ration of cations to anions
When writing the formula for any ionic compound, the charge of the ions must
balance
Ionic Compounds
compounds composed of cations (metals) and anions (nonmetals)
When writing formulas for ionic compounds write
the cation first followed by the anion