FORMULAS to NAMES IONIC and MOLECULAR Inside there are 50 chances for you to look at a formula and determine the proper or stock name of the compound. You are asked each time to first decide if it’s IONIC or MOLECULAR. You can tell if the 1st atom or part is a METAL, that’s ionic. If the 1st atom or part is a NONMETAL, then that’s is molecular. The only exception is when you see AMMONIUM, which starts with an N for nitrogen, but NH4+1 is a polyatomic cation, so those are ionic after all.

I suggest getting a piece of paper, and numbering 1-50 and doing them all. You might need to do some now, some later, and some again. Once you grade them, CORRECT YOURSELF in RED, that makes you really feel the sting of booboos. All mistakes, however small should be redone. If you can’t get through them all error free, study more. Ask your teacher what’s up with things, learn the rules for naming. You can do this without paper, but when you do it in your head, you are going to be too nice to yourself. You should be able to write it exactly correct, not “almost right but I won’t forget it next time so I will take a point now anyway” correct. Exactly correct is the standard.

MgO What is the name of this compound? Is it ionic or molecular?

MgO Magnesium Oxide THINK: Mg is a metal, this is an ionic compound Mg makes a +2 cation Mg+2 O makes a -2 anion O-2 Mg+2 O-2 2:2 ratio becomes 1:1 Magnesium Oxide

TaF5 What is the name of this compound? Is it ionic or molecular?

TaF5 Tantalum fluoride (no RN, only 1 kind of cation) THINK: Ta is a metal, this is an ionic compound Ta makes a +5 cation Ta+5 F makes a -1 anion F-1 Ta+5 F-1 1:5 ratio Tantalum fluoride (no RN, only 1 kind of cation)

SrCl2 What is the name of this compound? Is it ionic or molecular?

SrCl2 Strontium chloride THINK: Sr is a metal, this is an ionic compound Sr makes a +2 cation Sr+2 Cl makes a -1 anion Cl-1 Sr+2 Cl-1 1:2 ratio Strontium chloride

NiBr3 What is the name of this compound? Is it ionic or molecular?

NiBr3 Nickel III Bromide THINK: Ni is a transitional metal, this is an ionic compound Ni makes a +3 cation here Ni+3 Br makes a -1 anion Br-1 Ni+3 Cl-1 1:3 ratio Nickel III Bromide

CH4 What is the name of this compound? Is it ionic or molecular?

CH4 Carbon tetrahydride (AKA methane) THINK: C is a nonmetal, this is an molecular compound Use the prefix naming system 1:4 ratio Carbon tetrahydride (AKA methane)

TiO2 What is the name of this compound? Is it ionic or molecular?

TiO2 THINK: Ti is a transitional metal, this is an ionic compound Ti makes a +4 cation here Ti+4 O makes a -2 anion O-2 Ti+4 O-2 The 2:4 ratio becomes 1:2 Titanium IV oxide

NO2 What is the name of this compound? Is it ionic or molecular?

NO2 THINK: N is a nonmetal, this is an molecular compound Use the prefix naming system 1:2 ratio Nitrogen dioxide

Ti2O3 What is the name of this compound? Is it ionic or molecular?

Ti2O3 THINK: Ti is a transitional metal, this is an ionic compound Ti makes a +3 cation here Ti+3 O makes a -2 anion O-2 Ti+3 O-2 2:3 ratio Titanium III oxide

TiO What is the name of this compound? Is it ionic or molecular?

TiO THINK: Ti is a transitional metal, this is an ionic compound Ti makes a +2 cation here Ti+2 O makes a -2 anion O-2 Ti+2 O-2 1:1 ratio Titanium II oxide

AlN What is the name of this compound? Is it ionic or molecular?

AlN Aluminum nitride THINK: Al is a metal, this is an ionic compound Al makes a +3 cation here Al+3 N makes a -3 anion N-3 Al+3 N-3 The 3:3 ratio becomes a 1:1 ratio Aluminum nitride

PCl3 What is the name of this compound? Is it ionic or molecular?

PCl3 Phosphorous trichloride THINK: P is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Phosphorous trichloride

BF3 What is the name of this compound? Is it ionic or molecular?

BF3 Boron trifluoride (rhymes with…) THINK: B is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Boron trifluoride (rhymes with…)

CF4 What is the name of this compound? Is it ionic or molecular?

CF4 Carbon tetrafluoride THINK: C is a nonmetal, this is an molecular compound Use the prefix naming system 1:4 ratio Carbon tetrafluoride

N2O3 What is the name of this compound? Is it ionic or molecular?

N2O3 Dinitrogen trioxide THINK: N is a nonmetal, this is an molecular compound Use the prefix naming system 2:3 ratio Dinitrogen trioxide

OF2 What is the name of this compound? Is it ionic or molecular?

OF2 THINK: O is a nonmetal, this is an molecular compound Use the prefix naming system 1:2 ratio Oxygen difluoride

SO3 What is the name of this compound? Is it ionic or molecular?

SO3 THINK: S is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Sulfur trioxide

SiO2 What is the name of this compound? Is it ionic or molecular?

SiO2 THINK: Si is a nonmetal, this is an molecular compound Use the prefix naming system 1:2 ratio Silicon dioxide

SiF4 What is the name of this compound? Is it ionic or molecular?

SiF4 Silicon tetrafluoride THINK: Si is a nonmetal, this is an molecular compound Use the prefix naming system 1:4 ratio Silicon tetrafluoride

H2S What is the name of this compound? Is it ionic or molecular?

H2S Dihydrogen monosulfide (this is stink gas!) THINK: H is a nonmetal, this is an molecular compound Use the prefix naming system 2:1 ratio Dihydrogen monosulfide (this is stink gas!)

AsBr5 What is the name of this compound? Is it ionic or molecular?

AsBr5 Arsenic pentabromide THINK: As is a nonmetal, this is an molecular compound Use the prefix naming system 1:5 ratio Arsenic pentabromide

SeO3 What is the name of this compound? Is it ionic or molecular?

SeO3 THINK: Se is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Selenium trioxide

PI3 What is the name of this compound? Is it ionic or molecular?

PI3 Phosphorous triiodide THINK: P is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Phosphorous triiodide

FCl What is the name of this compound? Is it ionic or molecular?

FCl Fluorine monochloride THINK: F is a nonmetal, this is an molecular compound Use the prefix naming system 1:1 ratio Fluorine monochloride

HBr What is the name of this compound? Is it ionic or molecular?

HBr Hydrogen monobromide THINK: H is a nonmetal, this is an molecular compound Use the prefix naming system 1:1 ratio Hydrogen monobromide

SBr6 What is the name of this compound? Is it ionic or molecular?

SBr6 Sulfur hexabromide THINK: S is a nonmetal, this is an molecular compound Use the prefix naming system 1:6 ratio Sulfur hexabromide

PCl5 What is the name of this compound? Is it ionic or molecular?

PCl5 Phosphorous pentachloride THINK: P is a nonmetal, this is an molecular compound Use the prefix naming system 1:5 ratio Phosphorous pentachloride

V2O3 What is the name of this compound? Is it ionic or molecular?

V2O3 THINK: V is a transitional metal, this is an ionic compound V makes a +3 cation here V+3 O makes a -2 anion O-2 V+3 O-2 2:3 ratio Vanadium III oxide

Cr2(SO4)3 What is the name of this compound? Is it ionic or molecular?

Cr2(SO4)3 Chromium III sulfate THINK: Cr is a transitional metal, this is an ionic compound Cr makes a +3 cation here Cr+3 SO4-3 makes a -3 anion SO4-3 Cr+3 SO4-3 2:3 ratio Chromium III sulfate

AsI3 What is the name of this compound? Is it ionic or molecular?

AsI3 THINK: As is a nonmetal, this is an molecular compound Use the prefix naming system 1:3 ratio Arsenic triiodide

Ta(OH)5 What is the name of this compound? Is it ionic or molecular?

Ta(OH)5 Tantalum hydroxide (no RN needed) THINK: Ta is a transitional metal, this is an ionic compound Ta makes a +5 cation here Ta+5 OH-1 makes a -1 anion OH-1 Ta+5 OH-1 1:5 ratio Tantalum hydroxide (no RN needed)

IrCl3 What is the name of this compound? Is it ionic or molecular?

IrCl3 Iridium (III) chloride THINK: Ir is a transitional metal, this is an ionic compound Ir makes a +3 cation here Ir+3 Cl-1 makes a -1 anion Cl-1 Ir+3 Cl-1 1:3 ratio Iridium (III) chloride

CSe2 What is the name of this compound? Is it ionic or molecular?

CSe2 THINK: C is a nonmetal, this is an molecular compound Use the prefix naming system 1:2 ratio Carbon diselenide

Ir3(PO4)4 What is the name of this compound? Is it ionic or molecular?

Ir3(PO4)4 Iridium (IV) phosphate THINK: Ir is a transitional metal, this is an ionic compound Ir makes a +4 cation here Ir+4 PO4-3 makes a -3 anion PO4-3 Ir+4 PO4-3 3:4 ratio Iridium (IV) phosphate

ZnO What is the name of this compound? Is it ionic or molecular?

ZnO Zinc oxide (no RN needed) THINK: Zn is a transitional metal, this is an ionic compound Zn makes a +2 cation here Zn+2 O makes a -2 anion O-2 Zn+2 O-2 1:1 ratio Zinc oxide (no RN needed)

CuO What is the name of this compound? Is it ionic or molecular?

CuO THINK: Cu is a transitional metal, this is an ionic compound Cu makes a +2 cation here Cu+2 O makes a -2 anion O-2 Cu+2 O-2 1:1 ratio Copper II oxide

Cu2O What is the name of this compound? Is it ionic or molecular?

Cu2O THINK: Cu is a transitional metal, this is an ionic compound Cu makes a +1 cation here Cu+1 O makes a -2 anion O-2 Cu+1 O-2 2:1 ratio Copper I oxide

CuS What is the name of this compound? Is it ionic or molecular?

CuS THINK: Cu is a transitional metal, this is an ionic compound Cu makes a +2 cation here Cu+2 S makes a -2 anion S-2 Cu+2 S-2 The 2:2 ratio becomes a 1:1 ratio Copper II sulfide

ZrS2 What is the name of this compound? Is it ionic or molecular?

ZrS2 Zirconium sulfide (no RN needed) THINK: Zr is a transitional metal, this is an ionic compound Zr makes a +4 cation here Zr+4 S makes a -2 anion S-2 Zr+4 S-2 The 2:4 ratio becomes a 1:2 ratio Zirconium sulfide (no RN needed)

ZnS What is the name of this compound? Is it ionic or molecular?

ZnS Zinc sulfide (no RN needed) THINK: Zn is a transitional metal, this is an ionic compound Zn makes a +2 cation here Zn+2 S makes a -2 anion S-2 Zn+2 S-2 1:1 ratio Zinc sulfide (no RN needed)

Ca(OH)2 What is the name of this compound? Is it ionic or molecular?

Ca(OH)2 Calcium hydroxide THINK: Ca is a metal, this is an ionic compound Ca makes a +2 cation here Ca+2 hydroxide makes a -1 anion OH-1 Ca+2 OH-1 1:2 ratio Calcium hydroxide

Mg3N2 What is the name of this compound? Is it ionic or molecular?

Mg3N2 THINK: Mg is a metal, this is an ionic compound Mg makes a +2 cation here Mg+2 N makes a -3 anion N-3 Mg+2 N-3 3:2 ratio Magnesium nitride

SrF2 What is the name of this compound? Is it ionic or molecular?

SrF2 Strontium fluoride THINK: Sr is a metal, this is an ionic compound Sr makes a +2 cation here Sr+2 F makes a -1 anion F-1 Sr+2 F-1 1:2 ratio Strontium fluoride

Rb3P What is the name of this compound? Is it ionic or molecular?

Rb3P Rubidium phosphide THINK: Rb is a metal, this is an ionic compound Rb makes a +1 cation here Rb+1 P makes a -3 anion P-3 Rb+1 P-3 3:1 ratio Rubidium phosphide

Rb3PO4 What is the name of this compound? Is it ionic or molecular?

Rb3PO4 Rubidium phosphate THINK: Rb is a metal, this is an ionic compound Rb makes a +1 cation here Rb+1 PO4-3 makes a -3 anion PO4-3 Rb+1 PO4-3 3:1 ratio Rubidium phosphate

(NH4)3PO4 What is the name of this compound? Is it ionic or molecular?

(NH4)3PO4 Ammonium phosphate THINK: NH4+1 makes a cation, this is an ionic compound NH4+1 makes a +1 cation here NH4+1 PO4-3 makes a -3 anion PO4-3 NH4+1 PO4-3 3:1 ratio Ammonium phosphate

NH4I What is the name of this compound? Is it ionic or molecular?

NH4I THINK: NH4+1 makes a cation, this is an ionic compound NH4+1 makes a +1 cation here NH4+1 I-1 makes a -1 anion I-1 NH4+1 I-1 1:1 ratio Ammonium iodide

AgNO3 What is the name of this compound? Is it ionic or molecular?

AgNO3 Silver nitrate (no RN needed) THINK: Ag+1 is a metal, this is an ionic compound Ag+1 makes a +1 cation here Ag+1 NO3-1 makes a -1 anion NO3-1 Ag+1 I-1 1:1 ratio Silver nitrate (no RN needed)

AgNO2 What is the name of this compound? Is it ionic or molecular?

AgNO2 Silver nitrite (no RN needed) THINK: Ag+1 is a metal, this is an ionic compound Ag+1 makes a +1 cation here Ag+1 NO2-1 makes a -1 anion NO2-1 Ag+1 I-1 1:1 ratio Silver nitrite (no RN needed)

Bi(NO2)5 What is the name of this compound? Is it ionic or molecular?

Bi(NO2)5 Bismuth (V) nitrite THINK: Bi is a transitional metal, this is an ionic compound Bi makes a +5 cation here Bi+5 NO2-1 makes a -1 anion NO2-1 Bi+5 NO2-1 1:5 ratio Bismuth (V) nitrite

Bi(NO3)5 What is the name of this compound? Is it ionic or molecular?

Bi(NO3)5 Bismuth (V) nitrate THINK: Bi is a transitional metal, this is an ionic compound Bi makes a +5 cation here Bi+5 NO3-1 makes a -1 anion NO3-1 Bi+5 NO3-1 1:5 ratio Bismuth (V) nitrate