ABCDEFGHIJKLMNOPQRSTUVWXYZAA
1
Z (atomic number)NameSymbolAverage
atomic mass
Average atomic mass cleanedElectronegativity
(Pauling)
First Ionization
Energy (eV)
Atomic Radii (pm)Van der Waals Radii (pm)Covalent Radii (pm)Valence
electrons
PA>KP
2
1HydrogenH1.0071.0072.213.5984425120381no47
3
2HeliumHe4.002602(2)4.00260224.5874131140322no
4
3LithiumLi6.941(2)6.9410.985.391721451821341yes
5
4BerylliumBe9.012182(3)9.0121821.579.3227105902yes
6
5BoronB10.811(7)10.8112.048.2980385823yes
7
6CarbonC12.0107(8)12.01072.5511.260370170774no
8
7NitrogenN14.0067(2)14.00673.0414.5341465155755no
9
8OxygenO15.9994(3)15.99943.4413.6180660152736no
10
9FluorineF18.9984032(5)18.99840323.9817.4228250147717no
11
10NeonNe20.1797(6)20.179721.564638154698no
12
11SodiumNa22.98976928(2)22.989769280.935.139081802271541yes
13
12MagnesiumMg24.3050(6)24.3051.317.646241501731302yes
14
13AluminiumAl26.9815386(8)26.98153861.615.985771251183yes
15
14SiliconSi28.0855(3)28.08551.98.151691102101114no
16
15PhosphorusP30.973762(2)30.9737622.1910.486691001801065no
17
16SulfurS32.065(5)32.0652.5810.360011001801026no
18
17ChlorineCl35.453(2)35.4533.1612.96764100175997yes
19
18ArgonAr39.948(1)39.94815.7596271188978no
20
19PotassiumK39.0983(1)39.09830.824.340662202751961yes
21
20CalciumCa40.078(4)40.07816.113161801742yes
22
21ScandiumSc44.955912(6)44.9559121.366.56151601442yes
23
22TitaniumTi47.867(1)47.8671.546.82811401362yes
24
23VanadiumV50.9415(1)50.94151.636.74621351252yes
25
24ChromiumCr51.9961(6)51.99611.666.76651401271yes
26
25ManganeseMn54.938045(5)54.9380451.557.434021401392yes
27
26IronFe55.845(2)55.8451.837.90241401252yes
28
27CobaltCo58.933195(5)58.9331951.917.63981351631212yes
29
28NickelNi58.6934(4)58.69341.887.8811351262yes
30
29CopperCu63.546(3)63.5461.97.726381351401381no
31
30ZincZn65.38(2)65.381.659.39421351391312yes
32
31GalliumGa69.723(1)69.7231.815.99931301871263yes
33
32GermaniumGe72.63(1)72.632.017.89941251224yes
34
33ArsenicAs74.92160(2)74.92162.189.78861151851195no
35
34SeleniumSe78.96(3)78.962.559.752381151901166no
36
35BromineBr79.904(1)79.9042.9611.813811151851147yes
37
36KryptonKr83.798(2)83.798313.99961882021108no
38
37RubidiumRb85.4678(3)85.46780.824.177132352111yes
39
38StrontiumSr87.62(1)87.620.955.69492001922yes
40
39YttriumY88.90585(2)88.905851.226.21711801622yes
41
40ZirconiumZr91.224(2)91.2241.336.63391551482yes
42
41NiobiumNb92.90638(2)92.906381.66.758851451371yes
43
42MolybdenumMo95.96(2)95.962.167.092431451451no
44
43TechnetiumTc[98]981.97.281351561no
45
44RutheniumRu101.07(2)101.072.27.36051301261yes
46
45RhodiumRh102.90550(2)102.90552.287.45891351351no
47
46PalladiumPd106.42(1)106.422.28.3369140163131yes
48
47SilverAg107.8682(2)107.86821.937.57621601721531yes
49
48CadmiumCd112.411(8)112.4111.698.99381551581482yes
50
49IndiumIn114.818(3)114.8181.785.786361551931443yes
51
50TinSn118.710(7)118.711.967.34391452171414yes
52
51AntimonySb121.760(1)121.762.058.60841451385yes
53
52TelluriumTe127.60(3)127.62.19.00961402061356yes
54
53IodineI126.90447(3)126.904472.6610.451261401981337yes
55
54XenonXe131.293(6)131.2932.612.12981082161308no
56
55CaesiumCs132.9054519(2)132.90545190.793.89392602251yes
57
56BariumBa137.327(7)137.3270.895.21172151982yes
58
57LanthanumLa138.90547(7)138.905471.15.57691951692yes
59
58CeriumCe140.116(1)140.1161.125.53871852no
60
59PraseodymiumPr140.90765(2)140.907651.135.4731852no
61
60NeodymiumNd144.242(3)144.2421.145.5251852no
62
61PromethiumPm[145]1455.5821852no
63
62SamariumSm150.36(2)150.361.175.64361852no
64
63EuropiumEu151.964(1)151.9645.67041852no
65
64GadoliniumGd157.25(3)157.251.26.15011802no
66
65TerbiumTb158.92535(2)158.925355.86381752no
67
66DysprosiumDy162.500(1)162.51.225.93891752no
68
67HolmiumHo164.93032(2)164.930321.236.02151752no
69
68ErbiumEr167.259(3)167.2591.246.10771752no
70
69ThuliumTm168.93421(2)168.934211.256.184311752no
71
70YtterbiumYb173.054(5)173.0546.254161752no
72
71LutetiumLu174.9668(1)174.96681.275.42591751602yes
73
72HafniumHf178.49(2)178.491.36.825071551502yes
74
73TantalumTa180.94788(2)180.947881.57.54961451382yes
75
74TungstenW183.84(1)183.842.367.8641351462no
76
75RheniumRe186.207(1)186.2071.97.83351351592no
77
76OsmiumOs190.23(3)190.232.28.43821301282yes
78
77IridiumIr192.217(3)192.2172.28.9671351372no
79
78PlatinumPt195.084(9)195.0842.288.95871351751281yes
80
79GoldAu196.966569(4)196.9665692.549.22551351661441no
81
80MercuryHg200.59(2)200.59210.43751501551492yes
82
81ThalliumTl204.3833(2)204.38331.626.10821901961483yes
83
82LeadPb207.2(1)207.22.337.416661802021474yes
84
83BismuthBi208.98040(1)208.98042.027.28561601465yes
85
84PoloniumPo[209]20928.4171906no
86
85AstatineAt[210]2102.27no
87
86RadonRn[222]22210.74851201458no
88
87FranciumFr[223]2230.74.07271no
89
88RadiumRa[226]2260.95.27842152no
90
89ActiniumAc[227]2271.15.171952no
91
90ThoriumTh232.03806(2)232.038061.36.30671802no
92
91ProtactiniumPa231.03588(2)231.035881.55.891802no
93
92UraniumU238.02891(3)238.028911.386.194051751862no
94
93NeptuniumNp[237]2371.366.26571752no
95
94PlutoniumPu[244]2441.286.02621752no
96
95AmericiumAm[243]2431.35.97381752no
97
96CuriumCm[247]2471.35.99152no
98
97BerkeliumBk[247]2471.36.19792no
99
98CaliforniumCf[251]2511.36.28172no
100
99EinsteiniumEs[252]2521.36.422no