2. 1
3. 2
4. 3
5. 4
6. 5
7. 6
8. 7
9. 8
10. 9
11. 10
12. 11
13. 12
14. 13
15. 14
16. 15
17. 16
18. 17
19. 18
20. 1
21. 1 H Hydrogen 1,008
22. 2 He Helium 4.0026
23. 2
24. 3 Li Lithium 6.94
25. 4 Be Beryllium 9.0122
26. 5 B Boron 10.81
27. 6 C Carbon 12.011
28. 7 N Nitrogen 14.007
29. 8 O Oxygen 15.999
30. 9 F Fluorine 18.998
31. 10 Ne Neon 20.180
32. 3
33. 11 Na Sodium 22.990
34. 12 Mg Magnesium 24.305
35. 13 Al Aluminium 26.982
36. 14 Si Silicon 28.085
37. 15 P Phosphorus 30.974
38. 16 S Sulfur 32.06
39. 17 Cl Chlorine 35.45
40. 18 Ar Argon 39.948
41. 4
42. 19 K Potassium 39.098
43. 20 Ca Calcium 40.078
44. 21 Sc Scandium 44.956
45. 22 Ti Titanium 47.867
46. 23 V Vanadium 50.942
47. 24 Cr Cronium 51.996
48. 25 Mn Manganese 54.938
49. 26 Fe Iron 55.845
50. 27 Co Cobalt 58.933
51. 28 Ni Nickel 58.693
52. 29 Cu Copper 63.546
53. 30 Zn Zinc 65.38
54. 31 Ga Gallium 69.723
55. 32 Ge Germanium 72.630
56. 33 As Arsenic 74.922
57. 34 Se Selenium 78.971
58. 35 Br Bromine 79.904
59. 36 Kr Krypton 83.798
60. 5
61. 37 Rb Rubidium 85.468
62. 38 Sr Strontium 87.62
63. 39 Y Yttrium 88.906
64. 40 Zr Zirconium 91.224
65. 41 Nb Niobium 92.906
66. 42 Mo Molybdenum 95.95
67. 43 Tc Technetium (98)
68. 44 Ru Ruthenium 101.07
69. 45 Rh Rhodium 102.91
70. 46 Pd Palladium 106.42
71. 47 Ag Silver 107.87
72. 48 Cd Cadmium 112.41
73. 49 In Indium 114.82
74. 50 Sn Tin 118.71
75. 51 Sb Antimony 121.76
76. 52 Te Tellurium 127.60
77. 53 I Iodine 126.90
78. 54 Xe Xenon 131.29
79. 6
80. 55 Cs Caesium 132.91
81. 56 Ba Barium 137.33
83. 72 Ha Hafnium 178.49
84. 73 Ta Tantalum 180.95
85. 74 W Tungsten 183.84
86. 75 Re Rhenium 186.21
87. 76 Os Osmium 190.23
88. 77 Ir Iridium 192.22
89. 78 Pt Platinum 195.08
90. 79 Au Gold 196.97
91. 80 Hg Mercury 200.59
92. 81 Tl Thallium 204.38
93. 82 Pb Lead 207.2
94. 83 Bi Bismuth 208.98
95. 84 Po Polonium (209)
96. 85 At Astatine (210)
97. 86 Rn Radon (222)
98. 7
99. 87 Fr Francium (223)
100. 88 Ra Radium (226)
101. 104 Rf Rutherfordium (267)
102. 105 Db Dubnium (268)
103. 106 Sg Seaborgium (269)
104. 107 Bh Bohrium (270)
105. 108 Hs Hassium (277)
106. 109 Mt Meitnerium (278)
107. 110 Ds Darmstadtium (281)
108. 111 Rg Roentgenium (282)
109. 112 Cn Copernicium (285)
110. 113 Nh Nihonium (286)
111. 114 Fl Flerovium (289)
112. 115 Mc Moscovium (290)
113. 116 Lv Livermorium (293)
114. 117 Ts Tenessine (294)
115. 118 Og Oganesson (294)
116. 57 La Lanthanum 138.91
117. 58 Ce Cerium 140.12
118. 59 Pr Praseodymium 140.91
119. 60 Nd Neodymium 144.24
120. 61 Pm Promethium 145
121. 62 Sm Samarium 150.36
122. 63 Eu Europium 151.96
123. 64 Gd Gadolinium 157.25
124. 65 Tb Terbium 158.93
125. 66 Dy Dysprosium 162.50
126. 67 Ho Holmium 164.93
127. 68 Er Erbium 167.26
128. 69 Tm Tjulium 168.93
129. 70 Yb Ytterbium 173.05
130. 71 Lu Lutetium 174.97
131. 89 Ac Actonium 227
132. 90 Th Thorium 232.04
133. 91 Pa Praseodymium 231.04
134. 92 U Uranium 238.03
135. 93 Np Neptunium 237
136. 94 Pu Plutonium 244
137. 95 Am Americium 243
138. 96 Cm Curium 247
139. 97 Bk Berkelium 247
140. 98 Cf Californium 251
141. 99 Es Einsteinium 252
142. 100 Fm Fermium 257
143. 101 Md Mendelevium 258
144. 102 No Nobelium 259
145. 103 Lr Lawrencium 266