ABCDEFGHIJKLMNOPQRSTUVWXYZ
1
Z (atomic number)NameSymbolAverage
atomic mass
Electronegativity
(Pauling)
First Ionization
Energy (eV)
Atomic Radii (pm)Van der Waals Radii (pm)Covalent Radii (pm)Valence
electrons
Average atomic mass cleaned
2
1HydrogenH1.0072.213.59844251203811.0073.98
3
2HeliumHe4.002602(2)24.58741311403224.002602
4
3LithiumLi6.941(2)0.985.3917214518213416.941
5
4BerylliumBe9.012182(3)1.579.32271059029.012182
6
5BoronB10.811(7)2.048.298038582310.811
7
6CarbonC12.0107(8)2.5511.26037017077412.0107
8
7NitrogenN14.0067(2)3.0414.534146515575514.0067
9
8OxygenO15.9994(3)3.4413.618066015273615.9994
10
9FluorineF18.9984032(5)3.9817.422825014771718.9984032
11
10NeonNe20.1797(6)21.56463815469820.1797
12
11SodiumNa22.98976928(2)0.935.13908180227154122.98976928
13
12MagnesiumMg24.3050(6)1.317.64624150173130224.305
14
13AluminiumAl26.9815386(8)1.615.98577125118326.9815386
15
14SiliconSi28.0855(3)1.98.15169110210111428.0855
16
15PhosphorusP30.973762(2)2.1910.48669100180106530.973762
17
16SulfurS32.065(5)2.5810.36001100180102632.065
18
17ChlorineCl35.453(2)3.1612.9676410017599735.453
19
18ArgonAr39.948(1)15.759627118897839.948
20
19PotassiumK39.0983(1)0.824.34066220275196139.0983
21
20CalciumCa40.078(4)16.11316180174240.078
22
21ScandiumSc44.955912(6)1.366.5615160144244.955912
23
22TitaniumTi47.867(1)1.546.8281140136247.867
24
23VanadiumV50.9415(1)1.636.7462135125250.9415
25
24ChromiumCr51.9961(6)1.666.7665140127151.9961
26
25ManganeseMn54.938045(5)1.557.43402140139254.938045
27
26IronFe55.845(2)1.837.9024140125255.845
28
27CobaltCo58.933195(5)1.917.6398135163121258.933195
29
28NickelNi58.6934(4)1.887.881135126258.6934
30
29CopperCu63.546(3)1.97.72638135140138163.546
31
30ZincZn65.38(2)1.659.3942135139131265.38
32
31GalliumGa69.723(1)1.815.9993130187126369.723
33
32GermaniumGe72.63(1)2.017.8994125122472.63
34
33ArsenicAs74.92160(2)2.189.7886115185119574.9216
35
34SeleniumSe78.96(3)2.559.75238115190116678.96
36
35BromineBr79.904(1)2.9611.81381115185114779.904
37
36KryptonKr83.798(2)313.9996188202110883.798
38
37RubidiumRb85.4678(3)0.824.17713235211185.4678
39
38StrontiumSr87.62(1)0.955.6949200192287.62
40
39YttriumY88.90585(2)1.226.2171180162288.90585
41
40ZirconiumZr91.224(2)1.336.6339155148291.224
42
41NiobiumNb92.90638(2)1.66.75885145137192.90638
43
42MolybdenumMo95.96(2)2.167.09243145145195.96
44
43TechnetiumTc[98]1.97.28135156198
45
44RutheniumRu101.07(2)2.27.36051301261101.07
46
45RhodiumRh102.90550(2)2.287.45891351351102.9055
47
46PalladiumPd106.42(1)2.28.3369140163131106.42
48
47SilverAg107.8682(2)1.937.57621601721531107.8682
49
48CadmiumCd112.411(8)1.698.99381551581482112.411
50
49IndiumIn114.818(3)1.785.786361551931443114.818
51
50TinSn118.710(7)1.967.34391452171414118.71
52
51AntimonySb121.760(1)2.058.60841451385121.76
53
52TelluriumTe127.60(3)2.19.00961402061356127.6
54
53IodineI126.90447(3)2.6610.451261401981337126.90447
55
54XenonXe131.293(6)2.612.12981082161308131.293
56
55CaesiumCs132.9054519(2)0.793.89392602251132.9054519
57
56BariumBa137.327(7)0.895.21172151982137.327
58
57LanthanumLa138.90547(7)1.15.57691951692138.90547
59
58CeriumCe140.116(1)1.125.53871852140.116
60
59PraseodymiumPr140.90765(2)1.135.4731852140.90765
61
60NeodymiumNd144.242(3)1.145.5251852144.242
62
61PromethiumPm[145]5.5821852145
63
62SamariumSm150.36(2)1.175.64361852150.36
64
63EuropiumEu151.964(1)5.67041852151.964
65
64GadoliniumGd157.25(3)1.26.15011802157.25
66
65TerbiumTb158.92535(2)5.86381752158.92535
67
66DysprosiumDy162.500(1)1.225.93891752162.5
68
67HolmiumHo164.93032(2)1.236.02151752164.93032
69
68ErbiumEr167.259(3)1.246.10771752167.259
70
69ThuliumTm168.93421(2)1.256.184311752168.93421
71
70YtterbiumYb173.054(5)6.254161752173.054
72
71LutetiumLu174.9668(1)1.275.42591751602174.9668
73
72HafniumHf178.49(2)1.36.825071551502178.49
74
73TantalumTa180.94788(2)1.57.54961451382180.94788
75
74TungstenW183.84(1)2.367.8641351462183.84
76
75RheniumRe186.207(1)1.97.83351351592186.207
77
76OsmiumOs190.23(3)2.28.43821301282190.23
78
77IridiumIr192.217(3)2.28.9671351372192.217
79
78PlatinumPt195.084(9)2.288.95871351751281195.084
80
79GoldAu196.966569(4)2.549.22551351661441196.966569
81
80MercuryHg200.59(2)210.43751501551492200.59
82
81ThalliumTl204.3833(2)1.626.10821901961483204.3833
83
82LeadPb207.2(1)2.337.416661802021474207.2
84
83BismuthBi208.98040(1)2.027.28561601465208.9804
85
84PoloniumPo[209]28.4171906209
86
85AstatineAt[210]2.27210
87
86RadonRn[222]10.74851201458222
88
87FranciumFr[223]0.74.07271223
89
88RadiumRa[226]0.95.27842152226
90
89ActiniumAc[227]1.15.171952227
91
90ThoriumTh232.03806(2)1.36.30671802232.03806
92
91ProtactiniumPa231.03588(2)1.55.891802231.03588
93
92UraniumU238.02891(3)1.386.194051751862238.02891
94
93NeptuniumNp[237]1.366.26571752237
95
94PlutoniumPu[244]1.286.02621752244
96
95AmericiumAm[243]1.35.97381752243
97
96CuriumCm[247]1.35.99152247
98
97BerkeliumBk[247]1.36.19792247
99
98CaliforniumCf[251]1.36.28172251
100
99EinsteiniumEs[252]1.36.422252