Symbols and Charges for Monoatomic Ions

Symbols and Charges for Monoatomic Ions

Fixed Charge

Symbol         Name                   Symbol         Name

H⁺              hydrogen ion           H^-              hydride

Li⁺             lithium ion            F^-              fluoride

Na⁺             sodium ion             Cl^-             chloride

K⁺              potassium ion          Br^-             bromide

Rb⁺             rubidium ion           I^-              iodide

Cs⁺             cesium ion             O^2-             oxide

Be²⁺            beryllium ion          S^2-             sulfide

Mg²⁺            magnesium ion          Se^2-            selenide

Ca²⁺            calcium ion            Te^2-            telluride

Sr²⁺            strontium ion          N^3-             nitride

Ba²⁺            barium ion             P^3-             phosphide

Ra²⁺            radium ion             As^3-            arsenide

Ag⁺             silver ion

Zn²⁺            zinc ion               Al³⁺            aluminum ion

Note that the letters in an ion's name before the -ide ending is the stem.

For example, the stem for bromide is brom-. Also, just in case, the P for

phosphide is a capital P.

Symbols and Charges for Monoatomic Ions

Variable Charge

        Systematic name Common                 Systematic name Common

Symbol  (Stock system) name           Symbol  (Stock system) 	name

Cu⁺     copper(I)      cuprous        	Hg₂²⁺    mercury(I)     	mercurous

Cu²⁺    copper(II)     cupric         	Hg²⁺    	mercury(II)    	mercuric

Fe²⁺    iron(II)       ferrous        	Pb²⁺    	lead(II)       	plumbous

Fe³⁺    iron(III)      ferric         	Pb⁴⁺    	lead(IV)       	plumbic

Sn²⁺    tin(II)        stannous       	Co²⁺    	cobalt(II)     	cobaltous

Sn⁴⁺    tin(IV)        stannic        	Co³⁺    	cobalt(III)    	cobaltic

Cr²⁺    chromium(II)   chromous       	Ni²⁺    	nickel(II)     	nickelous

Cr³⁺    chromium(III)  chromic        	Ni⁴⁺    	nickel(IV)     	nickelic

Mn²⁺    manganese(II)  manganous      	Au⁺     	gold(I)        	aurous

Mn³⁺    manganese(III) manganic       	Au³⁺    	gold(III)      	auric

Symbols and Charges for Polyatomic Ions

Formula        	Name                   Formula        	Name

NO₃^1-            nitrate                ClO₄^1-           	perchlorate

NO₂^1-            nitrite                ClO₃^1-           	chlorate

CrO₄^2-          	chromate               ClO₂^1-           	chlorite

Cr₂O₇^2-          dichromate             ClO¹^-            	hypochlorite

CN^1-             cyanide                IO₄^1-            	periodate

MnO₄^1-           permanganate           IO₃^1-            	iodate

OH^1-             hydroxide              IO^1-             hypoiodite

O₂^2-            	peroxide               BrO₃^1-           	bromate

NH₂^-            	amine                  BrO¹^-            	hypobromite

CO₃^2-           	carbonate              HCO₃^1-           	hydrogen carbonate (bicarbonate)

SO₄^2-           	sulfate                HSO₄^1-           	hydrogen sulfate (bisulfate)

SO₃^2-           	sulfite                HSO₃^1-           	hydrogen sulfite (bisulfite)

C₂O₄^2-           oxalate                HC₂O₄^1-          	hydrogen oxalate (binoxalate)

PO₄^3-           	phosphate              HPO₄^2-          	hydrogen phosphate

PO₃^3-           	phosphite              H₂PO₄^1-          	dihydrogen phosphate

S₂O₃^2-           thiosulfate            HS^1-             	hydrogen sulfide

AsO₄^3-          	arsenate               BO₃^3-           	borate

SeO₄^2-          	selenate               B₄O₇^2-           	tetraborate

SiO₃^2-          	silicate               SiF₆^2-          	hexafluorosilicate

C₄H₄O₆^2-         	tartrate	       SCN^1-thiocyanate

C₂H₃O₂^1-         acetate  (an alternate way to write acetate is CH₃COO^-and it is called ethanoate)

NH₄⁺ammonium

Note: Writing just the plus sign or minus sign for ions with +1 or -1 charges is

acceptable.