Criss-Cross Method
Sodium + Chlorine
NaCl
Sodium + Nitrate
NaNO₃
NaCl → Na charge?
Na+1
NO₃⁻
Nitrate
NaCl
Sodium Chloride
NaNO₃
Sodium nitrate
Magnesium + Oxygen
MgO
Potassium + Carbonate
K₂CO₃
MgO → Mg charge?
Mg+2
Nitrite
NO₂⁻
Aluminum oxide
Al₂O₃
Calcium carbonate
CaCO₃
Potassium + Bromine
KBr
Calcium + Hydroxide
Ca(OH)₂
CaCl₂ → Ca charge?
Ca+2
sulfate
SO₄²⁻
FeCl₂
Iron(II) chloride
K₂SO₄
Potassium sulfate
Calcium + Nitrogen
Ca3N2
Magnesium + Phosphate
Mg₃(PO₄)₂
FeCl₃ → Cl charge?
Cl-1
SO₃²⁻
Sulfite
Iron(III) chloride
FeCl₃
Magnesium nitrate
Mg(NO₃)₂
Aluminum + Oxygen
Al2O3
Aluminum + Sulfate
Al₂(SO₄)₃
Cu₂O → O charge
O-2
CO₃²⁻
Carbonate
Cu₂O
Copper(I) oxide
Al₂(SO₄)₃
Aluminum sulfate
Lithium + Sulfur
Li2S
Ammonium + Chloride
NH₄Cl
Pb(NO₃)₂ → Pb charge?
Pb+2
Acetate
C₂H₃O₂⁻
Copper(II) oxide
CuO
Calcium phosphate
Ca₃(PO₄)₂
Barium + Fluorine
BaF2
Calcium + Nitrate
Ca(NO₃)₂
Pb(C₂H₃O₂)₂ → C₂H₃O₂ charge?
C₂H₃O₂-1
Dichromate
Cr₂O₇²⁻
Cr₂O₃
Chromium(III) oxide
Fe(NO₃)₂
Iron(II) nitrate
Aluminum + Nitrogen
AlN
Aluminum + Hydroxide
Al(OH)₃
CuSO₄ → Cu charge?
Cu+2
CN⁻
Cyanide
Cobalt(III) bromide
CoBr₃
Iron(III) nitrate
Fe(NO₃)₃
Magnesium + Phosphorus
Mg3P2
Iron(III) + Chloride
FeCl₃
Ca(NO₃)₂ → Ca charge = ______
Ca²⁺
SCN⁻
Thiocyanate
NiS
Nickel(II) sulfide
Pb(C₂H₃O₂)₂
Lead(II) acetate
Calcium + Sulfur
CaS
Copper(II) + Sulfate
CuSO₄
K₂SO₄ → K charge = ______
K⁺
BO₃³⁻
Borate
Tin(IV) chloride
SnCl₄
Chromium(III) sulfate
Cr₂(SO₄)₃