Z Symbol Name Ar, standard
Table 1
Type
Abridged
Table 2
Conventional
Table 3
→ Short
Table 2, 3
→ Short-
rounded
m.s.i. Year changed Note

1 H hydrogen [1.007841.00811] 2 [1.00781.0082] 1.008 1.008 1.008 2009[1]
2 He helium 4.002602(2) 1 4.0026 4.0026 4.0026 1983[2]
3 Li lithium [6.9386.997] 2 [6.9386.997] 6.94 6.94 6.94 2009[3]
4 Be beryllium 9.0121831(5) 1 9.0122 9.0122 9.0122 2013[4]
5 B boron [10.80610.821] 2 [10.80610.821] 10.81 10.81 10.81 2009[5]
6 C carbon [12.009612.0116] 2 [12.00912.012] 12.011 12.011 12.011 2009[6]
7 N nitrogen [14.0064314.00728] 2 [14.00614.008] 14.007 14.007 14.007 2009[7]
8 O oxygen [15.9990315.99977] 2 [15.99916.000] 15.999 15.999 15.999 2009[8]
9 F fluorine 18.998403163(6) 1 18.998 18.998 18.998 2013[9]
10 Ne neon 20.1797(6) 1 20.180 20.180 20.180 1985[10]
11 Na sodium 22.98976928(2) 1 22.990 22.990 22.990 2005[11]
12 Mg magnesium [24.30424.307] 2 [24.30424.307] 24.305 24.305 24.305 2011[12]
13 Al aluminium 26.9815384(3) 1 26.982 26.982 26.982 2017[13]
14 Si silicon [28.08428.086] 2 [28.08428.086] 28.085 28.085 28.085 2009[14]
15 P phosphorus 30.973761998(5) 1 30.974 30.974 30.974 2013[15]
16 S sulfur [32.05932.076] 2 [32.05932.076] 32.06 32.06 32.06 2009[16]
17 Cl chlorine [35.44635.457] 2 [35.44635.457] 35.45 35.45 35.45 2009[17]
18 Ar argon [39.79239.963] 2 [39.79239.963] 39.95[18] 39.95 39.95 2017[19]
19 K potassium 39.0983(1) 1 39.098 39.098 39.098 1979[20]
20 Ca calcium 40.078(4) 1 40.078(4) 40.078(4) 40.078 1983[21]
21 Sc scandium 44.955908(5) 1 44.956 44.956 44.956 2013[22]
22 Ti titanium 47.867(1) 1 47.867 47.867 47.867 1993[23]
23 V vanadium 50.9415(1) 1 50.942 50.942 50.942 1977[24]
24 Cr chromium 51.9961(6) 1 51.996 51.996 51.996 1983[25]
25 Mn manganese 54.938043(2) 1 54.938 54.938 54.938 2017[26]
26 Fe iron 55.845(2) 1 55.845(2) 55.845(2) 55.845 1993[27]
27 Co cobalt 58.933194(3) 1 58.933 58.933 58.933 2017[28]
28 Ni nickel 58.6934(4) 1 58.693 58.693 58.693 2007[29]
29 Cu copper 63.546(3) 1 63.546(3) 63.546(3) 63.546 1969[30]
30 Zn zinc 65.38(2) 1 65.38(2) 65.38(2) 65.38 2007[31]
31 Ga gallium 69.723(1) 1 69.723 69.723 69.723 1987[32]
32 Ge germanium 72.630(8) 1 72.630(8) 72.630(8) 72.630 2009[33]
33 As arsenic 74.921595(6) 1 74.922 74.922 74.922 2013[34]
34 Se selenium 78.971(8) 1 78.971(8) 78.971(8) 78.971 2013[35]
35 Br bromine [79.90179.907] 2 [79.90179.907] 79.904 79.904 79.904 2011[36]
36 Kr krypton 83.798(2) 1 83.798(2) 83.798(2) 83.798 2001[37]
37 Rb rubidium 85.4678(3) 1 85.468 85.468 85.468 1969[38]
38 Sr strontium 87.62(1) 1 87.62 87.62 87.62 1969[39]
39 Y yttrium 88.90584(1) 1 88.906 88.906 88.906 2017[40]
40 Zr zirconium 91.224(2) 1 91.224(2) 91.224(2) 91.224 1983[41]
41 Nb niobium 92.90637(1) 1 92.906 92.906 92.906 2017[42]
42 Mo molybdenum 95.95(1) 1 95.95 95.95 95.95 2013[43]
43 Tc technetium - 3 [97]
44 Ru ruthenium 101.07(2) 1 101.07(2) 101.07(2) 101.07 1983[44]
45 Rh rhodium 102.90549(2) 1 102.91 102.91 102.91 2017[45]
46 Pd palladium 106.42(1) 1 106.42 106.42 106.42 1979[46]
47 Ag silver 107.8682(2) 1 107.87 107.87 107.87 1985[47]
48 Cd cadmium 112.414(4) 1 112.41 112.41 112.41 2013[48]
49 In indium 114.818(1) 1 114.82 114.82 114.82 2011[49]
50 Sn tin 118.710(7) 1 118.71 118.71 118.71 1983[50]
51 Sb antimony 121.760(1) 1 121.76 121.76 121.76 1993[51]
52 Te tellurium 127.60(3) 1 127.60(3) 127.60(3) 127.60 1969[52]
53 I iodine 126.90447(3) 1 126.90 126.90 126.90 1985[53]
54 Xe xenon 131.293(6) 1 131.29 131.29 131.29 1999[54]
55 Cs caesium 132.90545196(6) 1 132.91 132.91 132.91 2013[55]
56 Ba barium 137.327(7) 1 137.33 137.33 137.33 1985[56]
57 La lanthanum 138.90547(7) 1 138.91 138.91 138.91 2005[57]
58 Ce cerium 140.116(1) 1 140.12 140.12 140.12 1995[58]
59 Pr praseodymium 140.90766(1) 1 140.91 140.91 140.91 2017[59]
60 Nd neodymium 144.242(3) 1 144.24 144.24 144.24 2005[60]
61 Pm promethium - 3 [145]
62 Sm samarium 150.36(2) 1 150.36(2) 150.36(2) 150.36 2005[61]
63 Eu europium 151.964(1) 1 151.96 151.96 151.96 1995[62]
64 Gd gadolinium 157.25(3) 1 157.25(3) 157.25(3) 157.25 1969[63]
65 Tb terbium 158.925354(8) 1 158.93 158.93 158.93 2017[64]
66 Dy dysprosium 162.500(1) 1 162.50 162.50 162.50 2001[65]
67 Ho holmium 164.930328(7) 1 164.93 164.93 164.93 2017[66]
68 Er erbium 167.259(3) 1 167.26 167.26 167.26 1999[67]
69 Tm thulium 168.934218(6) 1 168.93 168.93 168.93 2017[68]
70 Yb ytterbium 173.045(10) 1 173.05 173.05 173.05 2015[69]
71 Lu lutetium 174.9668(1) 1 174.97 174.97 174.97 2007[70]
72 Hf hafnium 178.486(6) 1 178.49 178.49(2) 178.49 2019[71]
73 Ta tantalum 180.94788(2) 1 180.95 180.95 180.95 2005[72]
74 W tungsten 183.84(1) 1 183.84 183.84 The time allocated for running scripts has expired. W: 1991[73]
75 Re Re: Rhenium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Re: 1973[74]
76 Os Os: Osmium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Os: 1991[75]
77 Ir Ir: Iridium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Ir: 2017[76]
78 Pt Pt: Platinum The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Pt: 2005[77]
79 Au Au: Gold The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Au: 2017[78]
80 Hg Hg: Mercury (element) The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Hg: 2011[79]
81 Tl Tl: Thallium [The time allocated for running scripts has expired.The time allocated for running scripts has expired.] 2 [The time allocated for running scripts has expired.The time allocated for running scripts has expired.] The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Tl: 2009[80]
82 Pb Pb: Lead [The time allocated for running scripts has expired.The time allocated for running scripts has expired.] 2 [The time allocated for running scripts has expired.The time allocated for running scripts has expired.] The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Pb: 2020[81]
83 Bi Bi: Bismuth The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Bi: 2005[82]
84 Po Po: Polonium - 3 Po: The time allocated for running scripts has expired.
85 At At: Astatine - 3 At: The time allocated for running scripts has expired.
86 Rn Rn: Radon - 3 Rn: The time allocated for running scripts has expired.
87 Fr Fr: Francium - 3 Fr: The time allocated for running scripts has expired.
88 Ra Ra: Radium - 3 Ra: The time allocated for running scripts has expired.
89 Ac Ac: Actinium - 3 Ac: The time allocated for running scripts has expired.
90 Th Th: Thorium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Th: 2013[83]
91 Pa Pa: Protactinium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. Pa: 2017[84]
92 U U: Uranium The time allocated for running scripts has expired. 1 The time allocated for running scripts has expired. The time allocated for running scripts has expired. The time allocated for running scripts has expired. U: 1999[85]
93 Np Np: Neptunium - 3 Np: The time allocated for running scripts has expired.
94 Pu Pu: Plutonium - 3 Pu: The time allocated for running scripts has expired.
95 Am Am: Americium - 3 Am: The time allocated for running scripts has expired.
96 Cm Cm: Curium - 3 Cm: The time allocated for running scripts has expired.
97 Bk Bk: Berkelium - 3 Bk: The time allocated for running scripts has expired.
98 Cf Cf: Californium - 3 Cf: The time allocated for running scripts has expired.
99 Es Es: Einsteinium - 3 Es: The time allocated for running scripts has expired.
100 Fm Fm: Fermium - 3 Fm: The time allocated for running scripts has expired.
101 Md Md: Mendelevium - 3 Md: The time allocated for running scripts has expired.
102 No No: Nobelium - 3 No: The time allocated for running scripts has expired.
103 Lr Lr: Lawrencium - 3 Lr: The time allocated for running scripts has expired.
104 Rf Rf: Rutherfordium - 3 Rf: The time allocated for running scripts has expired.
105 Db Db: Dubnium - 3 Db: The time allocated for running scripts has expired.
106 Sg Sg: Seaborgium - 3 Sg: The time allocated for running scripts has expired.
107 Bh Bh: Bohrium - 3 Bh: The time allocated for running scripts has expired.
108 Hs Hs: Hassium - 3 Hs: The time allocated for running scripts has expired.
109 Mt Mt: Meitnerium - 3 Mt: The time allocated for running scripts has expired.
110 Ds Ds: Darmstadtium - 3 Ds: The time allocated for running scripts has expired.
111 Rg Rg: Roentgenium - 3 Rg: The time allocated for running scripts has expired.
112 Cn Cn: Copernicium - 3 Cn: The time allocated for running scripts has expired.
113 Nh Nh: Nihonium - 3 Nh: The time allocated for running scripts has expired.
114 Fl Fl: Flerovium - 3 Fl: The time allocated for running scripts has expired.
115 Mc Mc: Moscovium - 3 Mc: The time allocated for running scripts has expired.
116 Lv Lv: Livermorium - 3 Lv: The time allocated for running scripts has expired.
117 Ts Ts: Tennessine - 3 Ts: The time allocated for running scripts has expired.
118 Og Og: Oganesson - 3 Og: The time allocated for running scripts has expired.
119 Uue Uue: Ununennium - Uue:
120 Ubn Ubn: Unbinilium - Ubn:
121 Ubu Ubu: Unbiunium - Ubu:
122 Ubb Ubb: Unbibium - Ubb:
124 Ubq Ubq: Unbiquadium - Ubq:
126 Ubh Ubh: Unbihexium - Ubh:

References

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  3. ^ "Standard Atomic Weights: Lithium". CIAAW. 2009.
  4. ^ "Standard Atomic Weights: Beryllium". CIAAW. 2013.
  5. ^ "Standard Atomic Weights: Boron". CIAAW. 2009.
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  7. ^ "Standard Atomic Weights: Nitrogen". CIAAW. 2009.
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  85. ^ The time allocated for running scripts has expired.

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