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List of elements by atomic number



A table of chemical elements ordered by atomic number and color coded according to type of element. Given is each element's name, element symbol, group and period, Chemical series, and atomic mass (or most stable isotope).

Z
Name
Sym
Period
Group
Chemical series
Mass (g/mol)
1 Hydrogen H 1 1 Nonmetal 0,000,001 1.00794(7)[1] [2] [3]
2 Helium He 1 18 Noble gas 0,000,004 4.002602(2)[1] [3]
3 Lithium Li 2 1 Alkali metal 0,000,006 6.941(2)[1] [2] [3] [4]
4 Beryllium Be 2 2 Alkaline earth metal 0,000,009 9.012182(3)
5 Boron B 2 13 Metalloid 0,000,010 10.811(7)[1] [2] [3]
6 Carbon C 2 14 Nonmetal 0,000,012 12.0107(8)[1] [3]
7 Nitrogen N 2 15 Nonmetal 0,000,014 14.0067(2)[1] [3]
8 Oxygen O 2 16 Nonmetal 0,000,015 15.9994(3)[1] [3]
9 Fluorine F 2 17 Halogen 0,000,018 18.9984032(5)
10 Neon Ne 2 18 Noble gas 0,000,020 20.1797(6)[1] [2]
11 Sodium Na 3 1 Alkali metal 0,000,022 22.98976928(2)
12 Magnesium Mg 3 2 Alkaline earth metal 0,000,024 24.3050(6)
13 Aluminium Al 3 13 Poor metal 0,000,026 26.9815386(8)
14 Silicon Si 3 14 Metalloid 0,000,028 28.0855(3)[3]
15 Phosphorus P 3 15 Nonmetal 0,000,030 30.973762(2)
16 Sulfur S 3 16 Nonmetal 0,000,032 32.065(5)[1] [3]
17 Chlorine Cl 3 17 Halogen 0,000,035 35.453(2)[1] [2] [3]
18 Argon Ar 3 18 Noble gas 0,000,039 39.948(1)[1] [3]
19 Potassium K 4 1 Alkali metal 0,000,039 39.0983(1)
20 Calcium Ca 4 2 Alkaline earth metal 0,000,040 40.078(4)[1]
21 Scandium Sc 4 3 Transition metal 0,000,044 44.955912(6)
22 Titanium Ti 4 4 Transition metal 0,000,047 47.867(1)
23 Vanadium V 4 5 Transition metal 0,000,050 50.9415(1)
24 Chromium Cr 4 6 Transition metal 0,000,051 51.9961(6)
25 Manganese Mn 4 7 Transition metal 0,000,054 54.938045(5)
26 Iron Fe 4 8 Transition metal 0,000,055 55.845(2)
27 Cobalt Co 4 9 Transition metal 0,000,058 58.933195(5)
28 Nickel Ni 4 10 Transition metal 0,000,058 58.6934(2)
29 Copper Cu 4 11 Transition metal 0,000,063 63.546(3)[3]
30 Zinc Zn 4 12 Transition metal 0,000,065 65.409(4)
31 Gallium Ga 4 13 Poor metal 0,000,069 69.723(1)
32 Germanium Ge 4 14 Metalloid 0,000,072 72.64(1)
33 Arsenic As 4 15 Metalloid 0,000,074 74.92160(2)
34 Selenium Se 4 16 Nonmetal 0,000,078 78.96(3)[3]
35 Bromine Br 4 17 Halogen 0,000,079 79.904(1)
36 Krypton Kr 4 18 Noble gas 0,000,083 83.798(2)[1] [2]
37 Rubidium Rb 5 1 Alkali metal 0,000,085 85.4678(3)[1]
38 Strontium Sr 5 2 Alkaline earth metal 0,000,087 87.62(1)[1] [3]
39 Yttrium Y 5 3 Transition metal 0,000,088 88.90585(2)
40 Zirconium Zr 5 4 Transition metal 0,000,091 91.224(2)[1]
41 Niobium Nb 5 5 Transition metal 0,000,092 92.906 38(2)
42 Molybdenum Mo 5 6 Transition metal 0,000,095 95.94(2)[1]
43 Technetium Tc 5 7 Transition metal 0,000,098 [98.9063][5]
44 Ruthenium Ru 5 8 Transition metal 0,000,101 101.07(2)[1]
45 Rhodium Rh 5 9 Transition metal 0,000,102 102.90550(2)
46 Palladium Pd 5 10 Transition metal 0,000,106 106.42(1)[1]
47 Silver Ag 5 11 Transition metal 0,000,107 107.8682(2)[1]
48 Cadmium Cd 5 12 Transition metal 0,000,112 112.411(8)[1]
49 Indium In 5 13 Poor metal 0,000,114 114.818(3)
50 Tin Sn 5 14 Poor metal 0,000,118 118.710(7)[1]
51 Antimony Sb 5 15 Metalloid 0,000,121 121.760(1)[1]
52 Tellurium Te 5 16 Metalloid 0,000,127 127.60(3)[1]
53 Iodine I 5 17 Halogen 0,000,126 126.90447(3)
54 Xenon Xe 5 18 Noble gas 0,000,131 131.293(6)[1] [2]
55 Caesium Cs 6 1 Alkali metal 0,000,132 132.9054519(2)
56 Barium Ba 6 2 Alkaline earth metal 0,000,137 137.327(7)
57 Lanthanum La 6 Lanthanide 0,000,138 138.90547(7)[1]
58 Cerium Ce 6 Lanthanide 0,000,140 140.116(1)[1]
59 Praseodymium Pr 6 Lanthanide 0,000,140 140.90765(2)
60 Neodymium Nd 6 Lanthanide 0,000,144 144.242(3)[1]
61 Promethium Pm 6 Lanthanide 0,000,146 [146.9151][5]
62 Samarium Sm 6 Lanthanide 0,000,150 150.36(2)[1]
63 Europium Eu 6 Lanthanide 0,000,151 151.964(1)[1]
64 Gadolinium Gd 6 Lanthanide 0,000,157 157.25(3)[1]
65 Terbium Tb 6 Lanthanide 0,000,158 158.92535(2)
66 Dysprosium Dy 6 Lanthanide 0,000,162 162.500(1)[1]
67 Holmium Ho 6 Lanthanide 0,000,164 164.93032(2)
68 Erbium Er 6 Lanthanide 0,000,167 167.259(3)[1]
69 Thulium Tm 6 Lanthanide 0,000,168 168.93421(2)
70 Ytterbium Yb 6 Lanthanide 0,000,173 173.04(3)[1]
71 Lutetium Lu 6 3 Lanthanide 0,000,174 174.967(1)[1]
72 Hafnium Hf 6 4 Transition metal 0,000,178 178.49(2)
73 Tantalum Ta 6 5 Transition metal 0,000,180 180.9479(1)
74 Tungsten W 6 6 Transition metal 0,000,183 183.84(1)
75 Rhenium Re 6 7 Transition metal 0,000,186 186.207(1)
76 Osmium Os 6 8 Transition metal 0,000,190 190.23(3)[1]
77 Iridium Ir 6 9 Transition metal 0,000,192 192.217(3)
78 Platinum Pt 6 10 Transition metal 0,000,195 195.084(9)
79 Gold Au 6 11 Transition metal 0,000,196 196.966569(4)
80 Mercury Hg 6 12 Transition metal 0,000,200 200.59(2)
81 Thallium Tl 6 13 Poor metal 0,000,204 204.3833(2)
82 Lead Pb 6 14 Poor metal 0,000,207 207.2(1)[1] [3]
83 Bismuth Bi 6 15 Poor metal 0,000,208 208.98040(1)
84 Polonium Po 6 16 Metalloid 0,000,208 [208.9824][5]
85 Astatine At 6 17 Halogen 0,000,209 [209.9871][5]
86 Radon Rn 6 18 Noble gas 0,000,222 [222.0176][5]
87 Francium Fr 7 1 Alkali metal 0,000,223 [223.0197][5]
88 Radium Ra 7 2 Alkaline earth metal 0,000,226 [226.0254][5]
89 Actinium Ac 7 Actinide 0,000,227 [227.0278][5]
90 Thorium Th 7 Actinide 0,000,232 232.03806(2)[5] [1]
91 Protactinium Pa 7 Actinide 0,000,231 231.03588(2)[5]
92 Uranium U 7 Actinide 0,000,238 238.02891(3)[5] [1] [2]
93 Neptunium Np 7 Actinide 0,000,237 [237.0482][5]
94 Plutonium Pu 7 Actinide 0,000,244 [244.0642][5]
95 Americium Am 7 Actinide 0,000,243 [243.0614][5]
96 Curium Cm 7 Actinide 0,000,247 [247.0703][5]
97 Berkelium Bk 7 Actinide 0,000,247 [247.0703][5]
98 Californium Cf 7 Actinide 0,000,251 [251.0796][5]
99 Einsteinium Es 7 Actinide 0,000,252 [252.0829][5]
100 Fermium Fm 7 Actinide 0,000,257 [257.0951][5]
101 Mendelevium Md 7 Actinide 0,000,258 [258.0986][5]
102 Nobelium No 7 Actinide 0,000,259 [259.1009][5]
103 Lawrencium Lr 7 3 Actinide 0,000,260 [260.1053][5]
104 Rutherfordium Rf 7 4 Transition metal 0,000,261 [261.1087][5]
105 Dubnium Db 7 5 Transition metal 0,000,262 [262.1138][5]
106 Seaborgium Sg 7 6 Transition metal 0,000,263 [263.1182][5]
107 Bohrium Bh 7 7 Transition metal 0,000,262 [262.1229][5]
108 Hassium Hs 7 8 Transition metal 0,000,265 [265][5]
109 Meitnerium Mt 7 9 Transition metal 0,000,266 [266][5]
110 Darmstadtium Ds 7 10 Transition metal 0,000,269 [269][5]
111 Roentgenium Rg 7 11 Transition metal 0,000,272 [272][5]
112 Ununbium Uub 7 12 Transition metal 0,000,285 [285][5]
113 Ununtrium Uut 7 13 Poor metal 0,000,284 [284][5]
114 Ununquadium Uuq 7 14 Poor metal 0,000,289 [289][5]
115 Ununpentium Uup 7 15 Poor metal 0,000,288 [288][5]
116 Ununhexium Uuh 7 16 Poor metal 0,000,292 [292][5]
117 Ununseptium Uus 7 17 Halogen 0,000,293 [295] [6]
118 Ununoctium Uuo 7 18 Noble gas 0,000,294 [294][5]

Notes

  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
  2. ^ a b c d e f g h The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
  3. ^ a b c d e f g h i j k l m n o The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
  4. ^ The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.
  5. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element or characteristic isotopic composition.
  6. ^ This element has not been discovered/synthesized.

References

  • Atomic Weights of the Elements 2001, Pure Appl. Chem. 75(8), 1107-1122, 2003. Retrieved June 30, 2005. Atomic weights of elements with atomic numbers from 1-109 taken from this source.
  • IUPAC Standard Atomic Weights Revised (2005).
  • WebElements Periodic Table. Retrieved June 30, 2005. Atomic weights of elements with atomic numbers 110-116 taken from this source.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "List_of_elements_by_atomic_number". A list of authors is available in Wikipedia.
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