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Chemistry > List of Elements by Atomic Mass


Page location: Info Library> Chemistry > List of Elements by Atomic Mass
This list of elements is sorted by relative atomic mass. The number in brackets after each relative atomic mass denotes the uncertainty value, eg. 1.00794(7) means 1.00794 ± 0.00007.

Atomic Number Name Symbol Relative Atomic Mass Group Period
1 Hydrogen H 1.00794(7) 1 1
2 Helium He 4.002602(2) 18 1
3 Lithium Li 6.941(2) 1 2
4 Beryllium Be 9.012182(3) 2 2
5 Boron B 10.811(7) 13 2
6 Carbon C 12.0107(8) 14 2
7 Nitrogen N 14.0067(2) 15 2
8 Oxygen O 15.9994(3) 16 2
9 Fluorine F 18.9984032(5) 17 2
10 Neon Ne 20.1797(6) 18 2
11 Sodium (Natrium) Na 22.98976928(2) 1 3
12 Magnesium Mg 24.3050(6) 2 3
13 Aluminium (Aluminum) Al 26.9815386(8) 13 3
14 Silicon Si 28.0855(3) 14 3
15 Phosphorus P 30.973762(2) 15 3
16 Sulfur S 32.065(5) 16 3
17 Chlorine Cl 35.453(2) 17 3
19 Potassium (Kalium) K 39.0983(1) 1 4
18 Argon Ar 39.948(1) 18 3
20 Calcium Ca 40.078(4) 2 4
21 Scandium Sc 44.955912(6) 3 4
22 Titanium Ti 47.867(1) 4 4
23 Vanadium V 50.9415(1) 5 4
24 Chromium Cr 51.9961(6) 6 4
25 Manganese Mn 54.938045(5) 7 4
26 Iron (Ferrum) Fe 55.845(2) 8 4
28 Nickel Ni 58.6934(2) 10 4
27 Cobalt Co 58.933195(5) 9 4
29 Copper (Cuprum) Cu 63.546(3) 11 4
30 Zinc Zn 65.409(4) 12 4
31 Gallium Ga 69.723(1) 13 4
32 Germanium Ge 72.64(1) 14 4
33 Arsenic As 74.92160(2) 15 4
34 Selenium Se 78.96(3) 16 4
35 Bromine Br 79.904(1) 17 4
36 Krypton Kr 83.798(2) 18 4
37 Rubidium Rb 85.4678(3) 1 5
38 Strontium Sr 87.62(1) 2 5
39 Yttrium Y 88.90585(2) 3 5
40 Zirconium Zr 91.224(2) 4 5
41 Niobium Nb 92.906 38(2) 5 5
42 Molybdenum Mo 95.94(2) 6 5
43 Technetium Tc [98] 7 5
44 Ruthenium Ru 101.07(2) 8 5
45 Rhodium Rh 102.905 50(2) 9 5
46 Palladium Pd 106.42(1) 10 5
47 Silver (Argentum) Ag 107.8682(2) 11 5
48 Cadmium Cd 112.411(8) 12 5
49 Indium In 114.818(3) 13 5
50 Tin (Stannum) Sn 118.710(7) 14 5
51 Antimony (Stibium) Sb 121.760(1) 15 5
52 Tellurium Te 127.60(3) 16 5
53 Iodine I 126.904 47(3) 17 5
54 Xenon Xe 131.293(6) 18 5
55 Caesium (Cesium) Cs 132.9054519(2) 1 6
56 Barium Ba 137.327(7) 2 6
57 Lanthanum La 138.90547(7) n/a 6
58 Cerium Ce 140.116(1) n/a 6
59 Praseodymium Pr 140.90765(2) n/a 6
60 Neodymium Nd 144.242(3) n/a 6
61 Promethium Pm [145] n/a 6
62 Samarium Sm 150.36(2) n/a 6
63 Europium Eu 151.964(1) n/a 6
64 Gadolinium Gd 157.25(3) n/a 6
65 Terbium Tb 158.92535(2) n/a 6
66 Dysprosium Dy 162.500(1) n/a 6
67 Holmium Ho 164.930 32(2) n/a 6
68 Erbium Er 167.259(3) n/a 6
69 Thulium Tm 168.93421(2) n/a 6
70 Ytterbium Yb 173.04(3) n/a 6
71 Lutetium Lu 174.967(1) 3 6
72 Hafnium Hf 178.49(2) 4 6
73 Tantalum Ta 180.94788(2) 5 6
74 Tungsten (Wolfram) W 183.84(1) 6 6
75 Rhenium Re 186.207(1) 7 6
76 Osmium Os 190.23(3) 8 6
77 Iridium Ir 192.217(3) 9 6
78 Platinum Pt 195.084(9) 10 6
79 Gold (Aurum) Au 196.966569(4) 11 6
80 Mercury (Hydrargyrum) Hg 200.59(2) 12 6
81 Thallium Tl 204.3833(2) 13 6
82 Lead (Plumbum) Pb 207.2(1) 14 6
83 Bismuth Bi 208.98040(1) 15 6
84 Polonium Po [210] 16 6
85 Astatine At [210] 17 6
86 Radon Rn [220] 18 6
87 Francium Fr [223] 1 7
88 Radium Ra [226] 2 7
89 Actinium Ac [227] n/a 7
91 Protactinium Pa 231.03588(2) n/a 7
90 Thorium Th 232.03806(2) n/a 7
93 Neptunium Np [237] n/a 7
92 Uranium U 238.02891(3) n/a 7
95 Americium Am [243] n/a 7
94 Plutonium Pu [244] n/a 7
96 Curium Cm [247] n/a 7
97 Berkelium Bk [247] n/a 7
98 Californium Cf [251] n/a 7
99 Einsteinium Es [252] n/a 7
100 Fermium Fm [257] n/a 7
101 Mendelevium Md [258] n/a 7
102 Nobelium No [259] n/a 7
103 Lawrencium Lr [262] 3 7
104 Rutherfordium Rf [261] 4 7
105 Dubnium Db [262] 5 7
106 Seaborgium Sg [266] 6 7
107 Bohrium Bh [264] 7 7
108 Hassium Hs [277] 8 7
109 Meitnerium Mt [268] 9 7
110 Darmstadtium Ds [271] 10 7
111 Roentgenium Rg [272] 11 7
112 Ununbium Uub [285] 12 7
113 Ununtrium Uut [284] 13 7
114 Ununquadium Uuq [289] 14 7
115 Ununpentium Uup [288] 15 7
116 Ununhexium Uuh [292] 16 7
118 Ununoctium Uuo [294] 18 7