FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
 
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Encyclopedia > List of elements by atomic mass

Hydrogen = 1


List of Elements in Atomic Number Order.

No Symbol Name Atomic Wt Notes
1 H Hydrogen 1.00794(7) 1, 2, 3
2 He Helium 4.002602(2) 1, 2
3 Li Lithium [6.941(2)] 1, 2, 3, 4
4 Be Beryllium 9.012182(3)
5 B Boron 10.811(7) 1, 2, 3
6 C Carbon 12.0107(8) 1, 2
7 N Nitrogen 14.0067(2) 1, 2
8 O Oxygen 15.9994(3) 1, 2
9 F Fluorine 18.9984032(5)
10 Ne Neon 20.1797(6) 1, 3
11 Na Sodium 22.989770(2)
12 Mg Magnesium 24.3050(6)
13 Al Aluminium 26.981538(2)
14 Si Silicon 28.0855(3) 2
15 P Phosphorus 30.973761(2)
16 S Sulfur 32.065(5) 1, 2
17 Cl Chlorine 35.453(2) 3
18 Ar Argon 39.948(1) 1, 2
19 K Potassium 39.0983(1) 1
20 Ca Calcium 40.078(4) 1
21 Sc Scandium 44.955910(8)
22 Ti Titanium 47.867(1)
23 V Vanadium 50.9415(1)
24 Cr Chromium 51.9961(6)
25 Mn Manganese 54.938049(9)
26 Fe Iron 55.845(2)
27 Co Cobalt 58.933200(9)
28 Ni Nickel 58.6934(2)
29 Cu Copper 63.546(3) 2
30 Zn Zinc 65.409(4)
31 Ga Gallium 69.723(1)
32 Ge Germanium 72.64(1)
33 As Arsenic 74.92160(2)
34 Se Selenium 78.96(3)
35 Br Bromine 79.904(1)
36 Kr Krypton 83.798(2) 1, 3
37 Rb Rubidium 85.4678(3) 1
38 Sr Strontium 87.62(1) 1, 2
39 Y Yttrium 88.90585(2)
40 Zr Zirconium 91.224(2) 1
41 Nb Niobium 92.90638(2)
42 Mo Molybdenum 95.94(2) 1
43 Tc Technetium [98] 5
44 Ru Ruthenium 101.07(2) 1
45 Rh Rhodium 102.90550(2)
46 Pd Palladium 106.42(1) 1
47 Ag Silver 107.8682(2) 1
48 Cd Cadmium 112.411(8) 1
49 In Indium 114.818(3)
50 Sn Tin 118.710(7) 1
51 Sb Antimony 121.760(1) 1
52 Te Tellurium 127.60(3) 1
53 I Iodine 126.90447(3)
54 Xe Xenon 131.293(6) 1, 3
55 Cs Caesium 132.90545(2)
56 Ba Barium 137.327(7)
57 La Lanthanum 138.9055(2) 1
58 Ce Cerium 140.116(1) 1
59 Pr Praseodymium 140.90765(2)
60 Nd Neodymium 144.24(3) 1
61 Pm Promethium [145] 5
62 Sm Samarium 150.36(3) 1
63 Eu Europium 151.964(1) 1
64 Gd Gadolinium 157.25(3) 1
65 Tb Terbium 158.92534(2)
66 Dy Dysprosium 162.500(1) 1
67 Ho Holmium 164.93032(2)
68 Er Erbium 167.259(3) 1
69 Tm Thulium 168.93421(2)
70 Yb Ytterbium 173.04(3) 1
71 Lu Lutetium 174.967(1) 1
72 Hf Hafnium 178.49(2)
73 Ta Tantalum 180.9479(1)
74 W Tungsten 183.84(1)
75 Re Rhenium 186.207(1)
76 Os Osmium 190.23(3) 1
77 Ir Iridium 192.217(3)
78 Pt Platinum 195.078(2)
79 Au Gold 196.96655(2)
80 Hg Mercury 200.59(2)
81 Tl Thallium 204.3833(2)
82 Pb Lead 207.2(1) 1, 2
83 Bi Bismuth 208.98038(2)
84 Po Polonium [209] 5
85 At Astatine [210] 5
86 Rn Radon [222] 5
87 Fr Francium [223] 5
88 Ra Radium [226] 5
89 Ac Actinium [227] 5
90 Th Thorium 232.0381(1) 1, 5
91 Pa Protactinium 231.03588(2) 5
92 U Uranium 238.02891(3) 1, 3, 5
93 Np Neptunium [237] 5
94 Pu Plutonium [244] 5
95 Am Americium [243] 5
96 Cm Curium [247] 5
97 Bk Berkelium [247] 5
98 Cf Californium [251] 5
99 Es Einsteinium [252] 5
100 Fm Fermium [257] 5
101 Md Mendelevium [258] 5
102 No Nobelium [259] 5
103 Lr Lawrencium [262] 5
104 Rf Rutherfordium [261] 5, 6
105 Db Dubnium [262] 5, 6
106 Sg Seaborgium [266] 5, 6
107 Bh Bohrium [264] 5, 6
108 Hs Hassium [277] 5, 6
109 Mt Meitnerium [268] 5, 6
110 Ds Darmstadtium [281] 5, 6
111 Rg Roentgenium [272] 5, 6
112 Uub Ununbium [285] 5, 6
114 Uuq Ununquadium [289] 5, 6
116 Uuh Ununhexium see Note above
118 Uuo Ununoctium see Note above
  1. Geological specimens are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such specimens and that given in the Table may exceed the stated uncertainty.
  2. Range in isotopic composition of normal terrestrial material prevents a more precise value being given; the tabulated value should be applicable to any normal material.
  3. Modified isotopic compositions may be found in commercially available material because it has been subject to an undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the Table can occur.
  4. Commercially available Li materials have atomic weights that range between 6.939 and 6.996; if a more accurate value is required, it must be determined for the specific material [range quoted for 1995 table 6.94 and 6.99].
  5. Element has no stable nuclides. The value enclosed in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However three such elements (Th, Pa, and U) do have a characteristic terrestrial isotopic composition, and for these an atomic weight is tabulated.
  6. The names and symbols for elements 112-118 are under review. The temporary system recommended by J Chatt, Pure Appl. Chem., 51, 381-384 (1979) is used above. The names of elements 101-109 were agreed in 1997 (See Pure Appl. Chem., 1997, 69, 2471-2473) and for element 110 in 2003 (see Pure Appl. Chem., 2003, 75, 1613-1615). The approved name for element 111 is also included.

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This is a list of chemical elements, sorted by atomic mass (or most stable isotope) and color coded according to type of element.
Each element's atomic number, name, element symbol, and group and period numbers on the periodic table are given.
For artificial elements the nucleon count of the most stable isotope is listed brackets [] as the atomic mass.
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