ABCDEFGHIJKLMNOPQRSTUVWXYZ
1
ZNameSymbolAverage
atomic mass
Electronegativity
(Pauling)
First Ionization
Energy (eV)
Radii (pm) AtomicRadii (pm) Van der WaalsRadii (pm) CovalentValence
electrons
2
1HydrogenH1,0072,213,5984425120381
3
2HeliumHe4.002602(2)24,5874131140322
4
3LithiumLi6.941(2)0,985,391721451821341
5
4BerylliumBe9.012182(3)1,579,3227105902
6
5BoronB10.811(7)2,048,2980385823
7
6CarbonC12.0107(8)2,5511,260370170774
8
7NitrogenN14.0067(2)3,0414,5341465155755
9
8OxygenO15.9994(3)3,4413,6180660152736
10
9FluorineF18.9984032(5)3,9817,4228250147717
11
10NeonNe20.1797(6)21,564638154698
12
11SodiumNa22.98976928(2)0,935,139081802271541
13
12MagnesiumMg24.3050(6)1,317,646241501731302
14
13AluminiumAl26.9815386(8)1,615,985771251183
15
14SiliconSi28.0855(3)1,98,151691102101114
16
15PhosphorusP30.973762(2)2,1910,486691001801065
17
16SulfurS32.065(5)2,5810,360011001801026
18
17ChlorineCl35.453(2)3,1612,96764100175997
19
18ArgonAr39.948(1)15,7596271188978
20
19PotassiumK39.0983(1)0,824,340662202751961
21
20CalciumCa40.078(4)16,113161801742
22
21ScandiumSc44.955912(6)1,366,56151601442
23
22TitaniumTi47.867(1)1,546,82811401362
24
23VanadiumV50.9415(1)1,636,74621351252
25
24ChromiumCr51.9961(6)1,666,76651401271
26
25ManganeseMn54.938045(5)1,557,434021401392
27
26IronFe55.845(2)1,837,90241401252
28
27CobaltCo58.933195(5)1,917,63981351631212
29
28NickelNi58.6934(4)1,887,8811351262
30
29CopperCu63.546(3)1,97,726381351401381
31
30ZincZn65.38(2)1,659,39421351391312
32
31GalliumGa69.723(1)1,815,99931301871263
33
32GermaniumGe72.63(1)2,017,89941251224
34
33ArsenicAs74.92160(2)2,189,78861151851195
35
34SeleniumSe78.96(3)2,559,752381151901166
36
35BromineBr79.904(1)2,9611,813811151851147
37
36KryptonKr83.798(2)313,99961882021108
38
37RubidiumRb85.4678(3)0,824,177132352111
39
38StrontiumSr87.62(1)0,955,69492001922
40
39YttriumY88.90585(2)1,226,21711801622
41
40ZirconiumZr91.224(2)1,336,63391551482
42
41NiobiumNb92.90638(2)1,66,758851451371
43
42MolybdenumMo95.96(2)2,167,092431451451
44
43TechnetiumTc[98]1,97,281351561
45
44RutheniumRu101.07(2)2,27,36051301261
46
45RhodiumRh102.90550(2)2,287,45891351351
47
46PalladiumPd106.42(1)2,28,3369140163131
48
47SilverAg107.8682(2)1,937,57621601721531
49
48CadmiumCd112.411(8)1,698,99381551581482
50
49IndiumIn114.818(3)1,785,786361551931443
51
50TinSn118.710(7)1,967,34391452171414
52
51AntimonySb121.760(1)2,058,60841451385
53
52TelluriumTe127.60(3)2,19,00961402061356
54
53IodineI126.90447(3)2,6610,451261401981337
55
54XenonXe131.293(6)2,612,12981082161308
56
55CaesiumCs132.9054519(2)0,793,89392602251
57
56BariumBa137.327(7)0,895,21172151982
58
57LanthanumLa138.90547(7)1,15,57691951692
59
58CeriumCe140.116(1)1,125,53871852
60
59PraseodymiumPr140.90765(2)1,135,4731852
61
60NeodymiumNd144.242(3)1,145,5251852
62
61PromethiumPm[145]5,5821852
63
62SamariumSm150.36(2)1,175,64361852
64
63EuropiumEu151.964(1)5,67041852
65
64GadoliniumGd157.25(3)1,26,15011802
66
65TerbiumTb158.92535(2)5,86381752
67
66DysprosiumDy162.500(1)1,225,93891752
68
67HolmiumHo164.93032(2)1,236,02151752
69
68ErbiumEr167.259(3)1,246,10771752
70
69ThuliumTm168.93421(2)1,256,184311752
71
70YtterbiumYb173.054(5)6,254161752
72
71LutetiumLu174.9668(1)1,275,42591751602
73
72HafniumHf178.49(2)1,36,825071551502
74
73TantalumTa180.94788(2)1,57,54961451382
75
74TungstenW183.84(1)2,367,8641351462
76
75RheniumRe186.207(1)1,97,83351351592
77
76OsmiumOs190.23(3)2,28,43821301282
78
77IridiumIr192.217(3)2,28,9671351372
79
78PlatinumPt195.084(9)2,288,95871351751281
80
79GoldAu196.966569(4)2,549,22551351661441
81
80MercuryHg200.59(2)210,43751501551492
82
81ThalliumTl204.3833(2)1,626,10821901961483
83
82LeadPb207.2(1)2,337,416661802021474
84
83BismuthBi208.98040(1)2,027,28561601465
85
84PoloniumPo[209]28,4171906
86
85AstatineAt[210]2,27
87
86RadonRn[222]10,74851201458
88
87FranciumFr[223]0,74,07271
89
88RadiumRa[226]0,95,27842152
90
89ActiniumAc[227]1,15,171952
91
90ThoriumTh232.03806(2)1,36,30671802
92
91ProtactiniumPa231.03588(2)1,55,891802
93
92UraniumU238.02891(3)1,386,194051751862
94
93NeptuniumNp[237]1,366,26571752
95
94PlutoniumPu[244]1,286,02621752
96
95AmericiumAm[243]1,35,97381752
97
96CuriumCm[247]1,35,99152
98
97BerkeliumBk[247]1,36,19792
99
98CaliforniumCf[251]1,36,28172
100
99EinsteiniumEs[252]1,36,422