The Elements: Symbols, Atomic Numbers(Z), Atomic Weights, and Pauling Electronegativities(c)

ElementSymbolZAtomic Weightc
ActiniumAc89(227)1.1
AluminiumAl1326.98151.5
AluminumAl1326.98151.5
AmericiumAm95(243)1.3
AntimonySb51121.751.9
ArgonAr1839.948 
ArsenicAs3374.92162.0
AstatineAt85(210)2.2
BariumBa561370.9
BerkeliumBk97(247)1.3
BerylliumBe49.01221.5
BismuthBi83208.9801.9
BoronB510.812.0
BromineBr3579.9042.8
CadmiumCd48112.401.7
CalciumCa2040.081.0
CadmiumCd48112.401.7
CaliforniumCf98(251)1.3
CarbonC612.0112.5
CeriumCe58140.121.1
CesiumCs55132.90540.7
ChlorineCl1735.4533.0
ChromiumCr2451.9961.6
CobaltCo2758.93321.8
CopperCu2963.5461.9
CuriumCm96(247)1.3
DysprosiumDy66162.501.1
EinsteiniumEs99(254)1.3
ErbiumEr68167.261.1
EuropiumEu63151.961.1
FermiumFm100(257)1.3
FluorineF918.99844.0
FranciumFr87(223)0.7
GadoliniumGd64157.251.1
GalliumGa3169.721.6
GermaniumGe3272.591.8
GoldAu79196.9662.4
HafniumHf72178.491.3
HeliumHe24.00260 
HolmiumHo67164.9301.1
HydrogenH11.00792.1
IndiumIn49114.821.7
IodineI53126.9042.5
IridiumIr77192.222.2
IronFe2655.8471.8
KryptonKr3683.80 
LanthanumLa57138.9051.1
LawrenciumLr103(256) 
LeadPb82207.21.8
LithiumLi36.9411.0
LutetiumLu71174.971.2
MagnesiumMg1224.3051.2
ManganeseMn2554.93801.5
ElementSymbolZAtomic Weightc
MendeleviumMd101(258)1.3
MercuryHg80200.591.9
MolybdenumMo4295.941.8
NeodymiumNd60144.241.1
NeonNe1020.179 
NeptuniumNp93237.0481.3
NickelNi2858.701.8
NiobiumNb4192.90641.6
NitrogenN714.00673.0
NobeliumNo102(255)1.3
OsmiumOs76190.22.2
OxygenO815.99943.5
PalladiumPd46106.42.2
PhosphorusP1530.97382.1
PlatinumPt78195.092.2
PlutoniumPu94(244)1.3
PoloniumPo84(210)2.0
PotassiumK1939.0980.8
PraseodymiumPr59140.9081.1
PromethiumPm61(147)1.1
ProtactiniumPa91231.0361.4
RadiumRa88226.0250.9
RadonRn86(222) 
RheniumRe75186.2071.9
RhodiumRh45102.9062.2
RubidiumRb3785.46780.8
RutheniumRu44101.072.2
RutherfordiumRf104(261) 
SamariumSm62150.41.1
ScandiumSc2144.95591.3
SeleniumSe3478.962.4
SiliconSi1428.0861.8
SilverAg47107.8681.9
SodiumNa1122.98980.9
StrontiumSr3887.621.0
SulfurS1632.062.5
TantalumTa73180.9481.5
TechnetiumTc4398.90621.9
TelluriumTe52127.602.1
TerbiumTb65158.9251.1
ThalliumTl81204.371.8
ThoriumTh90232.0381.2
ThuliumTm69168.9341.1
TinSn50118.691.8
TitaniumTi2247.901.5
TungstenW74183.851.7
UraniumU92238.0291.5
VanadiumV2350.94141.6
XenonXe54131.30 
YtterbiumYb70173.041.1
YttriumY3988.90591.2
ZincZn3065.381.6
ZirconiumZr4091.221.4

Reference: J.E. Huheey, E.A.Keiter, and R.L. Keiter, "Inorganic Chemistry," 4th ed., Harper Collins, NY, 1993