KEGG image  Elements with Biological Roles

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Periodic table

Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period
1 1
H		 2
He
2 3
Li		 4
Be		 5
B		 6
C		 7
N		 8
O		 9
F		 10
Ne
3 11
Na		 12
Mg		 13
Al		 14
Si		 15
P		 16
S		 17
Cl		 18
Ar
4 19
K		 20
Ca		 21
Sc		 22
Ti		 23
V		 24
Cr		 25
Mn		 26
Fe		 27
Co		 28
Ni		 29
Cu		 30
Zn		 31
Ga		 32
Ge		 33
As		 34
Se		 35
Br		 36
Kr
5 37
Rb		 38
Sr		 39
Y		 40
Zr		 41
Nb		 42
Mo		 43
Tc		 44
Ru		 45
Rh		 46
Pd		 47
Ag		 48
Cd		 49
In		 50
Sn		 51
Sb		 52
Te		 53
I		 54
Xe
6 55
Cs		 56
Ba		 * 71
Lu		 72
Hf		 73
Ta		 74
W		 75
Re		 76
Os		 77
Ir		 78
Pt		 79
Au		 80
Hg		 81
Tl		 82
Pb		 83
Bi		 84
Po		 85
At		 86
Rn
7 87
Fr		 88
Ra		 ** 103
Lr		 104
Rf		 105
Db		 106
Sg		 107
Bh		 108
Hs		 109
Mt		 110
Ds		 111
Rg		 112
Cn		 113
Nh		 114
Fl		 115
Mc		 116
Lv		 117
Ts		 118
Og
-
*Lanthanides * 57
La		 58
Ce		 59
Pr		 60
Nd		 61
Pm		 62
Sm		 63
Eu		 64
Gd		 65
Tb		 66
Dy		 67
Ho		 68
Er		 69
Tm		 70
Yb
**Actinides ** 89
Ac		 90
Th		 91
Pa		 92
U		 93
Np		 94
Pu		 95
Am		 96
Cm		 97
Bk		 98
Cf		 99
Es		 100
Fm		 101
Md		 102
No

The periodic table was taken from WebElements

Atomic mass

The following table shows the data used to compute exact mass and molecular weight in KEGG.

Element Most abundant isotope All isotopes Element
in KEGG
Isotope Atomic massa Abundance Average massb
1 H 1H 1.0078250 0.9999 1.0080
2 He 4He 4.0026033 1.0000 4.0026
3 Li 7Li 7.0160034 0.9241 6.9675
4 Be 9Be 9.0121831 1 9.0122
5 B 11B 11.0093054 0.801 10.8135
6 C 12C 12.0000000 0.9893 12.0106
7 N 14N 14.0030740 0.9964 14.0069
8 O 16O 15.9949146 0.9976 15.9994
9 F 19F 18.9984032 1 18.9984
10 Ne 20Ne 19.9924402 0.9048 20.1797 no
11 Na 23Na 22.9897693 1 22.9898
12 Mg 24Mg 23.9850417 0.7899 24.3055
13 Al 27Al 26.9815385 1 26.9815
14 Si 28Si 27.9769265 0.9222 28.085
15 P 31P 30.9737620 1 30.9738
16 S 32S 31.9720712 0.9499 32.0675
17 Cl 35Cl 34.9688527 0.7576 35.4515
18 Ar 40Ar 39.9623831 0.9960 39.948 no
19 K 39K 38.9637065 0.9326 39.0983
20 Ca 40Ca 39.9625909 0.9694 40.078
21 Sc 45Sc 44.9559083 1 44.9559 no
22 Ti 48Ti 47.9479420 0.7372 47.867
23 V 51V 50.9439570 0.9975 50.9415
24 Cr 52Cr 51.9405062 0.8379 51.9961
25 Mn 55Mn 54.9380439 1 54.9380
26 Fe 56Fe 55.9349363 0.9175 55.845
27 Co 59Co 58.9331943 1 58.9332
28 Ni 58Ni 57.9353424 0.6808 58.6934
29 Cu 63Cu 62.9295977 0.6915 63.546
30 Zn 64Zn 63.9291420 0.4917 65.38
31 Ga 69Ga 68.9255735 0.6011 69.723
32 Ge 74Ge 73.9211778 0.3650 72.630
33 As 75As 74.9215946 1 74.9216
34 Se 80Se 79.9165218 0.4961 78.971
35 Br 79Br 78.9183376 0.5069 79.904
36 Kr 84Kr 83.9114977 0.5699 83.798
37 Rb 85Rb 84.9117897 0.7217 85.4678
38 Sr 88Sr 87.9056125 0.8258 87.62
39 Y 89Y 88.9058403 1 88.9058 no
40 Zr 90Zr 89.9046977 0.5145 91.224
41 Nb 93Nb 92.9063730 1 92.9064 no
42 Mo 98Mo 97.9054048 0.2439 95.95
43 Tc 97Tc 96.9063667 98
44 Ru 102Ru 101.9043441 0.3155 101.07
45 Rh 103Rh 102.9054980 1 102.9055 no
46 Pd 106Pd 105.9034804 0.2733 106.42
47 Ag 107Ag 106.9050916 0.5184 107.8682
48 Cd 114Cd 113.9033651 0.2873 112.414
49 In 115In 114.9038788 0.9571 114.818
50 Sn 120Sn 119.9022016 0.3258 118.710
51 Sb 121Sb 120.9038120 0.5721 121.760
52 Te 130Te 129.9062227 0.3408 127.60
53 I 127I 126.9044719 1 126.9045
54 Xe 132Xe 131.9041551 0.2691 131.293
55 Cs 133Cs 132.9054520 1 132.9055
56 Ba 138Ba 137.9052470 0.7170 137.327
57 La 139La 138.9063563 0.9991 138.9055
58 Ce 140Ce 139.9054431 0.8845 140.116
59 Pr 141Pr 140.9076576 1 140.9077 no
60 Nd 142Nd 141.9077290 0.2715 144.242 no
61 Pm 145Pm 144.9127559 145 no
62 Sm 152Sm 151.9197397 0.2675 150.36
63 Eu 153Eu 152.9212380 0.5219 151.964 no
64 Gd 158Gd 157.9241123 0.2484 157.25
65 Tb 159Tb 158.9253547 1 158.9254 no
66 Dy 164Dy 163.9291819 0.2826 162.500
67 Ho 165Ho 164.9303288 1 164.9303 no
68 Er 166Er 165.9302995 0.3350 167.259 no
69 Tm 169Tm 168.9342179 1 168.9342 no
70 Yb 174Yb 173.9388664 0.3203 173.054 no
71 Lu 175Lu 174.9407752 0.9740 174.9668
72 Hf 180Hf 179.9465570 0.3508 178.49 no
73 Ta 181Ta 180.9479958 0.9999 180.9479 no
74 W 184W 183.9509309 0.3064 183.84
75 Re 187Re 186.9557501 0.6260 186.207 no
76 Os 192Os 191.9614770 0.4078 190.23 no
77 Ir 193Ir 192.9629216 0.627 192.217
78 Pt 195Pt 194.9647917 0.3378 195.084
79 Au 197Au 196.9665688 1 196.9666
80 Hg 202Hg 201.9706434 0.2986 200.592
81 Tl 205Tl 204.9744278 0.7048 204.3835
82 Pb 208Pb 207.9766525 0.524 207.2
83 Bi 209Bi 208.9803991 1 208.9804
84 Po 209Po 208.9824308 209 no
85 At 210At 209.9871479 210 no
86 Rn 211Rn 210.9906011 222
87 Fr 223Fr 223.0197360 223 no
88 Ra 223Ra 223.0185023 226
89 Ac 227Ac 227.0277523 227
90 Th 232Th 232.0380558 1 232.0377
91 Pa 231Pa 231.0358842 1 231.0359 no
92 U 238U 238.0507884 0.9927 238.0289 no
93 Np 236Np 236.046570 237 no
94 Pu 238Pu 238.0495601 244
95 Am 241Am 241.0568293 no
96 Cm 243Cm 243.0613893 no
97 Bk 247Bk 247.0703073 no
98 Cf 249Cf 249.0748539 no
99 Es 252Es 252.082980 no
100 Fm 257Fm 257.0951061 no
101 Md 258Md 258.0984315 no
102 No 259No 259.10103 no
103 Lr 262Lr 262.10961 no
104 Rf 267Rf 267.12179 no
105 Db 268Db 268.12567 no
106 Sg 271Sg 271.13393 no
107 Bh 272Bh 272.13826 no
108 Hs 270Hs 270.13429 no
109 Mt 276Mt 276.15159 no
110 Ds 281Ds 281.16451 no
111 Rg 280Rg 280.16514 no
112 Cn 285Cn 285.17712 no
113 Nh 284Nh 284.17873 no
114 Fl 289Fl 289.19042 no
115 Mc 288Mc 288.19274 no
116 Lv 293Lv 293.20449 no
117 Ts 292Ts 292.20746 no
118 Og 294Og 294.21392 no
a, used to compute exact mass in KEGG
b, used to compute molecular weight in KEGG

The data was taken from NIST (updated January 2015)

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Last updated: June 28, 2024