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 | [1.00784, 1.00811] | 2 | [1.0078, 1.0082] | 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 | [6.938, 6.997] | 2 | [6.938, 6.997] | 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 | [10.806, 10.821] | 2 | [10.806, 10.821] | 10.81 | 10.81 | 10.81 |
|
2009[5] | ||
6 | C | carbon | [12.0096, 12.0116] | 2 | [12.009, 12.012] | 12.011 | 12.011 | 12.011 |
|
2009[6] | ||
7 | N | nitrogen | [14.00643, 14.00728] | 2 | [14.006, 14.008] | 14.007 | 14.007 | 14.007 |
|
2009[7] | ||
8 | O | oxygen | [15.99903, 15.99977] | 2 | [15.999, 16.000] | 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 | [24.304, 24.307] | 2 | [24.304, 24.307] | 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 | [28.084, 28.086] | 2 | [28.084, 28.086] | 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 | [32.059, 32.076] | 2 | [32.059, 32.076] | 32.06 | 32.06 | 32.06 |
|
2009[16] | ||
17 | Cl | chlorine | [35.446, 35.457] | 2 | [35.446, 35.457] | 35.45 | 35.45 | 35.45 |
|
2009[17] | ||
18 | Ar | argon | [39.792, 39.963] | 2 | [39.792, 39.963] | 39.95[1] | 39.95 | 39.95 |
|
2017[18] | ||
19 | K | potassium | 39.0983(1) | 1 | 39.098 | 39.098 | 39.098 |
|
1979[19] | |||
20 | Ca | calcium | 40.078(4) | 1 | 40.078(4) | 40.078(4) | 40.078 |
|
1983[20] | |||
21 | Sc | scandium | 44.955908(5) | 1 | 44.956 | 44.956 | 44.956 |
|
2013[21] | |||
22 | Ti | titanium | 47.867(1) | 1 | 47.867 | 47.867 | 47.867 |
|
1993[22] | |||
23 | V | vanadium | 50.9415(1) | 1 | 50.942 | 50.942 | 50.942 |
|
1977[23] | |||
24 | Cr | chromium | 51.9961(6) | 1 | 51.996 | 51.996 | 51.996 |
|
1983[24] | |||
25 | Mn | manganese | 54.938043(2) | 1 | 54.938 | 54.938 | 54.938 |
|
2017[25] | |||
26 | Fe | iron | 55.845(2) | 1 | 55.845(2) | 55.845(2) | 55.845 |
|
1993[26] | |||
27 | Co | cobalt | 58.933194(3) | 1 | 58.933 | 58.933 | 58.933 |
|
2017[27] | |||
28 | Ni | nickel | 58.6934(4) | 1 | 58.693 | 58.693 | 58.693 |
|
2007[28] | |||
29 | Cu | copper | 63.546(3) | 1 | 63.546(3) | 63.546(3) | 63.546 |
|
1969[29] | |||
30 | Zn | zinc | 65.38(2) | 1 | 65.38(2) | 65.38(2) | 65.38 |
|
2007[30] | |||
31 | Ga | gallium | 69.723(1) | 1 | 69.723 | 69.723 | 69.723 |
|
1987[31] | |||
32 | Ge | germanium | 72.630(8) | 1 | 72.630(8) | 72.630(8) | 72.630 |
|
2009[32] | |||
33 | As | arsenic | 74.921595(6) | 1 | 74.922 | 74.922 | 74.922 |
|
2013[33] | |||
34 | Se | selenium | 78.971(8) | 1 | 78.971(8) | 78.971(8) | 78.971 |
|
2013[34] | |||
35 | Br | bromine | [79.901, 79.907] | 2 | [79.901, 79.907] | 79.904 | 79.904 | 79.904 |
|
2011[35] | ||
36 | Kr | krypton | 83.798(2) | 1 | 83.798(2) | 83.798(2) | 83.798 |
|
2001[36] | |||
37 | Rb | rubidium | 85.4678(3) | 1 | 85.468 | 85.468 | 85.468 |
|
1969[37] | |||
38 | Sr | strontium | 87.62(1) | 1 | 87.62 | 87.62 | 87.62 |
|
1969[38] | |||
39 | Y | yttrium | 88.90584(1) | 1 | 88.906 | 88.906 | 88.906 |
|
2017[39] | |||
40 | Zr | zirconium | 91.224(2) | 1 | 91.224(2) | 91.224(2) | 91.224 |
|
1983[40] | |||
41 | Nb | niobium | 92.90637(1) | 1 | 92.906 | 92.906 | 92.906 |
|
2017[41] | |||
42 | Mo | molybdenum | 95.95(1) | 1 | 95.95 | 95.95 | 95.95 |
|
2013[42] | |||
43 | Tc | technetium | - | 3 | [97]
|
|||||||
44 | Ru | ruthenium | 101.07(2) | 1 | 101.07(2) | 101.07(2) | 101.07 |
|
1983[43] | |||
45 | Rh | rhodium | 102.90549(2) | 1 | 102.91 | 102.91 | 102.91 |
|
2017[44] | |||
46 | Pd | palladium | 106.42(1) | 1 | 106.42 | 106.42 | 106.42 |
|
1979[45] | |||
47 | Ag | silver | 107.8682(2) | 1 | 107.87 | 107.87 | 107.87 |
|
1985[46] | |||
48 | Cd | cadmium | 112.414(4) | 1 | 112.41 | 112.41 | 112.41 |
|
2013[47] | |||
49 | In | indium | 114.818(1) | 1 | 114.82 | 114.82 | 114.82 |
|
2011[48] | |||
50 | Sn | tin | 118.710(7) | 1 | 118.71 | 118.71 | 118.71 |
|
1983[49] | |||
51 | Sb | antimony | 121.760(1) | 1 | 121.76 | 121.76 | 121.76 |
|
1993[50] | |||
52 | Te | tellurium | 127.60(3) | 1 | 127.60(3) | 127.60(3) | 127.60 |
|
1969[51] | |||
53 | I | iodine | 126.90447(3) | 1 | 126.90 | 126.90 | 126.90 |
|
1985[52] | |||
54 | Xe | xenon | 131.293(6) | 1 | 131.29 | 131.29 | 131.29 |
|
1999[53] | |||
55 | Cs | caesium | 132.90545196(6) | 1 | 132.91 | 132.91 | 132.91 |
|
2013[54] | |||
56 | Ba | barium | 137.327(7) | 1 | 137.33 | 137.33 | 137.33 |
|
1985[55] | |||
57 | La | lanthanum | 138.90547(7) | 1 | 138.91 | 138.91 | 138.91 |
|
2005[56] | |||
58 | Ce | cerium | 140.116(1) | 1 | 140.12 | 140.12 | 140.12 |
|
1995[57] | |||
59 | Pr | praseodymium | 140.90766(1) | 1 | 140.91 | 140.91 | 140.91 |
|
2017[58] | |||
60 | Nd | neodymium | 144.242(3) | 1 | 144.24 | 144.24 | 144.24 |
|
2005[59] | |||
61 | Pm | promethium | - | 3 | [145]
|
|||||||
62 | Sm | samarium | 150.36(2) | 1 | 150.36(2) | 150.36(2) | 150.36 |
|
2005[60] | |||
63 | Eu | europium | 151.964(1) | 1 | 151.96 | 151.96 | 151.96 |
|
1995[61] | |||
64 | Gd | gadolinium | 157.25(3) | 1 | 157.25(3) | 157.25(3) | 157.25 |
|
1969[62] | |||
65 | Tb | terbium | 158.925354(8) | 1 | 158.93 | 158.93 | 158.93 |
|
2017[63] | |||
66 | Dy | dysprosium | 162.500(1) | 1 | 162.50 | 162.50 | 162.50 |
|
2001[64] | |||
67 | Ho | holmium | 164.930328(7) | 1 | 164.93 | 164.93 | 164.93 |
|
2017[65] | |||
68 | Er | erbium | 167.259(3) | 1 | 167.26 | 167.26 | 167.26 |
|
1999[66] | |||
69 | Tm | thulium | 168.934218(6) | 1 | 168.93 | 168.93 | 168.93 |
|
2017[67] | |||
70 | Yb | ytterbium | 173.045(10) | 1 | 173.05 | 173.05 | 173.05 |
|
2015[68] | |||
71 | Lu | lutetium | 174.9668(1) | 1 | 174.97 | 174.97 | 174.97 |
|
2007[69] | |||
72 | Hf | hafnium | 178.486(6) | 1 | 178.49 | 178.49(2) | 178.49 |
|
2019[70] | |||
73 | Ta | tantalum | 180.94788(2) | 1 | 180.95 | 180.95 | 180.95 |
|
2005[71] | |||
74 | W | tungsten | 183.84(1) | 1 | 183.84 | 183.84 | 183.84 |
|
1991[72] | |||
75 | Re | rhenium | 186.207(1) | 1 | 186.21 | 186.21 | 186.21 |
|
1973[73] | |||
76 | Os | osmium | 190.23(3) | 1 | 190.23(3) | 190.23(3) | 190.23 |
|
1991[74] | |||
77 | Ir | iridium | 192.217(2) | 1 | 192.22 | 192.22 | 192.22 |
|
2017[75] | |||
78 | Pt | platinum | 195.084(9) | 1 | 195.08 | 195.08 | 195.08 |
|
2005[76] | |||
79 | Au | gold | 196.966570(4) | 1 | 196.97 | 196.97 | 196.97 |
|
2017[77] | |||
80 | Hg | mercury | 200.592(3) | 1 | 200.59 | 200.59 | 200.59 |
|
2011[78] | |||
81 | Tl | thallium | [204.382, 204.385] | 2 | [204.38, 204.39] | 204.38 | 204.38 | 204.38 |
|
2009[79] | ||
82 | Pb | lead | [206.14, 207.94] | 1 | 207.2 | 207.2 | 207.2 |
|
1969[80] | |||
83 | Bi | bismuth | 208.98040(1) | 1 | 208.98 | 208.98 | 208.98 |
|
2005[81] | |||
84 | Po | polonium | - | 3 | [209]
|
|||||||
85 | At | astatine | - | 3 | [210]
|
|||||||
86 | Rn | radon | - | 3 | [222]
|
|||||||
87 | Fr | francium | - | 3 | [223]
|
|||||||
88 | Ra | radium | - | 3 | [226]
|
|||||||
89 | Ac | actinium | - | 3 | [227]
|
|||||||
90 | Th | thorium | 232.0377(4) | 1 | 232.04 | 232.04 | 232.04 |
|
2013[82] | |||
91 | Pa | protactinium | 231.03588(1) | 1 | 231.04 | 231.04 | 231.04 |
|
2017[83] | |||
92 | U | uranium | 238.02891(3) | 1 | 238.03 | 238.03 | 238.03 |
|
1999[84] | |||
93 | Np | neptunium | - | 3 | [237]
|
|||||||
94 | Pu | plutonium | - | 3 | [244]
|
|||||||
95 | Am | americium | - | 3 | [243]
|
|||||||
96 | Cm | curium | - | 3 | [247]
|
|||||||
97 | Bk | berkelium | - | 3 | [247]
|
|||||||
98 | Cf | californium | - | 3 | [251]
|
|||||||
99 | Es | einsteinium | - | 3 | [252]
|
|||||||
100 | Fm | fermium | - | 3 | [257]
|
|||||||
101 | Md | mendelevium | - | 3 | [258]
|
|||||||
102 | No | nobelium | - | 3 | [259]
|
|||||||
103 | Lr | lawrencium | - | 3 | [266]
|
|||||||
104 | Rf | rutherfordium | - | 3 | [267]
|
|||||||
105 | Db | dubnium | - | 3 | [268]
|
|||||||
106 | Sg | seaborgium | - | 3 | [269]
|
|||||||
107 | Bh | bohrium | - | 3 | [270]
|
|||||||
108 | Hs | hassium | - | 3 | [269]
|
|||||||
109 | Mt | meitnerium | - | 3 | [278]
|
|||||||
110 | Ds | darmstadtium | - | 3 | [281]
|
|||||||
111 | Rg | roentgenium | - | 3 | [282]
|
|||||||
112 | Cn | copernicium | - | 3 | [285]
|
|||||||
113 | Nh | nihonium | - | 3 | [286]
|
|||||||
114 | Fl | flerovium | - | 3 | [289]
|
|||||||
115 | Mc | moscovium | - | 3 | [290]
|
|||||||
116 | Lv | livermorium | - | 3 | [293]
|
|||||||
117 | Ts | tennessine | - | 3 | [294]
|
|||||||
118 | Og | oganesson | - | 3 | [294]
|
|||||||
119 | Uue | ununennium | - |
|
[85] | |||||||
120 | Ubn | unbinilium | - |
|
[86] | |||||||
121 | Ubu | unbiunium | - |
|
[87] | |||||||
122 | Ubb | unbibium | - |
|
[88] | |||||||
124 | Ubq | unbiquadium | - |
|
[89] | |||||||
126 | Ubh | unbihexium | - |
|
[90] |