valency table

For your grade, the first twenty elements are important. You can learn the valency of first twenty elements (and a few other metals like iron which shows valencies of 2 and 3, zinc which show a valency of 2, copper which shows a valency of 2 and sometimes 1 etc), that would be sufficient. Also, many elements may show variable that is more than one valency. Following is the list of first 30 elements with their names, symbols, atomic numbers and valencies they show

 

 

ElementSymbolAtomic numberValency
HydrogenH11
HeliumHe20
LithiumLi31
BerylliumBe42
BoronB53
CarbonC64
NitrogenN73
OxygenO82
FluorineF91
NeonNe100
SodiumNa111
MagnesiumMg122
AluminiumAl133
SiliconSi144
PhosphorusP153, 5
SulphurS162, 4, 6
ChlorineCl171
ArgonAr180
PotassiumK191
CalciumCa202
ScandiumSc212, 3
TitaniumTi222, 3, 4
VanadiumV232, 3, 4, 5
ChromiumCr241, 2, 3, 4, 5, 6
ManganeseMn252, 3, 4, 5, 6, 7
IronFe262, 3, 4, 5, 6
CobaltCo272, 3, 4, 5
NickelNi282, 3, 4
CopperCu291, 2, 3
ZincZn302

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