Atomic Number - Symbol - Name - Atomic Weight
1 H - Hydrogen - 1.00794(4)
2 He - Helium - 4.002602(2)
3 Li - Lithium - 6.941(2)
4 Be - Beryllium - 9.012182(3)
5 B - Boron - 10.811(7)
6 C - Carbon - 12.0107(8)
7 N - Nitrogen - 14.0067(2)
8 O - Oxygen - 15.9994(3)
9 F - Fluorine - 18.9984032(5)
10 Ne - Neon - 20.1797(6)
11 Na - Sodium - 22.98976928(2)
12 Mg - Magnesium - 24.3050(6)
13 Al - Aluminium - 26.9815386(8)
14 Si - Silicon - 28.0855(3)
15 P - Phosphorus - 30.973762(2)
16 S - Sulfur - 32.065(5)
17 Cl - Chlorine - 35.453(2)
18 Ar - Argon - 39.948(1)
19 K - Potassium - 39.0983(1)
20 Ca - Calcium - 40.078(4)
21 Sc - Scandium - 44.955912(6)
22 Ti - Titanium - 47.867(1)
23 V - Vanadium - 50.9415(1)
24 Cr - Chromium - 51.9961(6)
25 Mn - Manganese - 54.938045(5)
26 Fe - Iron - 55.845(2)
27 Co - Cobalt - 58.933195(5)
28 Ni - - Nickel 58.6934(4)
29 Cu - Copper - 63.546(3)
30 Zn - Zinc - 65.38(2)
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)
37 Rb - Rubidium - 85.4678(3)
38 Sr - Strontium - 87.62(1)
39 Y - Yttrium - 88.90585(2)
40 Zr - Zirconium - 91.224(2)
41 Nb - Niobium - 92.90638(2)
42 Mo - Molybdenum - 95.96(2)
43 Tc - Technetium - [98]
44 Ru - Ruthenium - 101.07(2)
45 Rh - Rhodium - 102.90550(2)
46 Pd - Palladium - 106.42(1)
47 Ag - Silver - 107.8682(2)
48 Cd - Cadmium - 112.411(8)
49 In - Indium - 114.818(3)
50 Sn - Tin - 118.710(7)
51 Sb - Antimony - 121.760(1)
52 Te - Tellurium - 127.60(3)
53 I - Iodine - 126.90447(3)
54 Xe - Xenon - 131.293(6)
55 Cs - Cesium - 132.9054519(2)
56 Ba - Barium - 137.327(7)
57 La - Lanthanum - 138.90547(7)
58 Ce - Cerium - 140.116(1)
59 Pr - Praseodymium - 140.90765(2)
60 Nd - Neodymium - 144.242(3)
61 Pm - Promethium - [145]
62 Sm - Samarium - 150.36(2)
63 Eu - Europium - 151.964(1)
64 Gd - Gadolinium - 157.25(3)
65 Tb - Terbium - 158.92535(2)
66 Dy - Dysprosium - 162.500(1)
67 Ho - Holmium - 164.93032(2)
68 Er - Erbium - 167.259(3)
69 Tm - Thulium - 168.93421(2)
70 Yb - Ytterbium - 173.054(5)
71 Lu - Lutetium - 174.9668(1)
72 Hf - Hafnium - 178.49(2)
73 Ta - Tantalum - 180.94788(2)
74 W - Tungsten - 183.84(1)
75 Re - Rhenium - 186.207(1)
76 Os - Osmium - 190.23(3)
77 Ir - Iridium - 192.217(3)
78 Pt - Platinum - 195.084(9)
79 Au - Gold - 196.966569(4)
80 Hg - Mercury - 200.59(2)
81 Tl - Thallium - 204.3833(2)
82 Pb - Lead - 207.2(1)
83 Bi - Bismuth - 208.98040(1)
84 Po - Polonium - [209]
85 At - Astatine - [210]
86 Rn - Radon - [222]
87 Fr - Francium - [223]
88 Ra - Radium - [226]
89 Ac - Actinium - [227]
90 Th - Thorium - 232.03806(2)
91 Pa - Protactinium - 231.03588(2)
92 U - Uranium - 238.02891(3)
93 Np - Neptunium - [237]
94 Pu - Plutonium - [244]
95 Am - Americium - [243]
96 Cm - Curium - [247]
97 Bk - Berkelium - [247]
98 Cf - Californium - [251]
99 Es - Einsteinium - [252]
100 Fm - Fermium - [257]
101 Md - Mendelevium - [258]
102 No - Nobelium - [259]
103 Lr - Lawrencium - [262]
104 Rf - Rutherfordium - [267]
105 Db - Dubnium - [268]
106 Sg - Seaborgium - [271]
107 Bh - Bohrium - [272]
108 Hs - Hassium - [270]
109 Mt - Meitnerium - [276]
110 Ds - Darmstadtium - [281]
111 Rg - Roentgenium - [280]
112 Uub - Ununbium - [285]
113 Uut - Ununtrium - [284]
114 Uuq - Ununquadium - [289]
115 Uup - Ununpentium - [288]
116 Uuh - Ununhexium - [293]
118 Uuo - Ununoctium - [294]
Values given in square brackets (e.g., Fm [257]) are the mass numbers of the longest-lived isotope of elements that do not have stable nuclides. However, atomic weights are provided for Th, Pa, and U because these elements have a characteristic abundance in the earth's crust.
For detailed element facts, consult the Periodic Table for individual elements.
