List of elements by atomic number

From Wikipedia, the free encyclopedia

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, and atomic mass (or most stable isotope).

**Chemical series of the periodic table**
Alkali metals	Alkaline earth metals	Lanthanides	Actinides	Transition metals
Poor metals	Metalloids	Nonmetals	Halogens	Noble gases

Atomic number	Name	Symbol	Period, Group	Mass (g/mol)
1	Hydrogen	H	1, 1	1.00794(7)<ref name="fn_2">The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.</ref> <ref name="fn_3">The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.</ref> <ref name="fn_4">The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.</ref>
2	Helium	He	1, 18	4.002602(2)<ref name="fn_2" /> <ref name="fn_4" />
3	Lithium	Li	2, 1	6.941(2)<ref name="fn_2" /> <ref name="fn_3" /> <ref name="fn_4" /> <ref>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.</ref>
4	Beryllium	Be	2, 2	9.012182(3)
5	Boron	B	2, 13	10.811(7)<ref name="fn_2" /> <ref name="fn_3" /> <ref name="fn_4" />
6	Carbon	C	2, 14	12.0107(8)<ref name="fn_2" /> <ref name="fn_4" />
7	Nitrogen	N	2, 15	14.0067(2)<ref name="fn_2" /> <ref name="fn_4" />
8	Oxygen	O	2, 16	15.9994(3)<ref name="fn_2" /> <ref name="fn_4" />
9	Fluorine	F	2, 17	18.9984032(5)
10	Neon	Ne	2, 18	20.1797(6)<ref name="fn_2" /> <ref name="fn_3" />
11	Sodium	Na	3, 1	22.98976928(2)
12	Magnesium	Mg	3, 2	24.3050(6)
13	Aluminium	Al	3, 13	26.9815386(8)
14	Silicon	Si	3, 14	28.0855(3)<ref name="fn_4" />
15	Phosphorus	P	3, 15	30.973762(2)
16	Sulfur	S	3, 16	32.065(5)<ref name="fn_2" /> <ref name="fn_4" />
17	Chlorine	Cl	3, 17	35.453(2)<ref name="fn_2" /> <ref name="fn_3" /> <ref name="fn_4" />
18	Argon	Ar	3, 18	39.948(1)<ref name="fn_2" /> <ref name="fn_4" />
19	Potassium	K	4, 1	39.0983(1)
20	Calcium	Ca	4, 2	40.078(4)<ref name="fn_2" />
21	Scandium	Sc	4, 3	44.955912(6)
22	Titanium	Ti	4, 4	47.867(1)
23	Vanadium	V	4, 5	50.9415(1)
24	Chromium	Cr	4, 6	51.9961(6)
25	Manganese	Mn	4, 7	54.938045(5)
26	Iron	Fe	4, 8	55.845(2)
27	Cobalt	Co	4, 9	58.933195(5)
28	Nickel	Ni	4, 10	58.6934(2)
29	Copper	Cu	4, 11	63.546(3)<ref name="fn_4" />
30	Zinc	Zn	4, 12	65.409(4)
31	Gallium	Ga	4, 13	69.723(1)
32	Germanium	Ge	4, 14	72.64(1)
33	Arsenic	As	4, 15	74.92160(2)
34	Selenium	Se	4, 16	78.96(3)<ref name="fn_4" />
35	Bromine	Br	4, 17	79.904(1)
36	Krypton	Kr	4, 18	83.798(2)<ref name="fn_2" /> <ref name="fn_3" />
37	Rubidium	Rb	5, 1	85.4678(3)<ref name="fn_2" />
38	Strontium	Sr	5, 2	87.62(1)<ref name="fn_2" /> <ref name="fn_4" />
39	Yttrium	Y	5, 3	88.90585(2)
40	Zirconium	Zr	5, 4	91.224(2)<ref name="fn_2" />
41	Niobium	Nb	5, 5	92.906 38(2)
42	Molybdenum	Mo	5, 6	95.94(2)<ref name="fn_2" />
43	Technetium	Tc	5, 7	[98.9063]<ref name="fn_1">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.</ref>
44	Ruthenium	Ru	5, 8	101.07(2)<ref name="fn_2" />
45	Rhodium	Rh	5, 9	102.90550(2)
46	Palladium	Pd	5, 10	106.42(1)<ref name="fn_2" />
47	Silver	Ag	5, 11	107.8682(2)<ref name="fn_2" />
48	Cadmium	Cd	5, 12	112.411(8)<ref name="fn_2" />
49	Indium	In	5, 13	114.818(3)
50	Tin	Sn	5, 14	118.710(7)<ref name="fn_2" />
51	Antimony	Sb	5, 15	121.760(1)<ref name="fn_2" />
52	Tellurium	Te	5, 16	127.60(3)<ref name="fn_2" />
53	Iodine	I	5, 17	126.90447(3)
54	Xenon	Xe	5, 18	131.293(6)<ref name="fn_2" /> <ref name="fn_3" />
55	Caesium	Cs	6, 1	132.9054519(2)
56	Barium	Ba	6, 2	137.327(7)
57	Lanthanum	La	6	138.90547(7)<ref name="fn_2" />
58	Cerium	Ce	6	140.116(1)<ref name="fn_2" />
59	Praseodymium	Pr	6	140.90765(2)
60	Neodymium	Nd	6	144.242(3)<ref name="fn_2" />
61	Promethium	Pm	6	[146.9151]<ref name="fn_1" />
62	Samarium	Sm	6	150.36(2)<ref name="fn_2" />
63	Europium	Eu	6	151.964(1)<ref name="fn_2" />
64	Gadolinium	Gd	6	157.25(3)<ref name="fn_2" />
65	Terbium	Tb	6	158.92535(2)
66	Dysprosium	Dy	6	162.500(1)<ref name="fn_2" />
67	Holmium	Ho	6	164.93032(2)
68	Erbium	Er	6	167.259(3)<ref name="fn_2" />
69	Thulium	Tm	6	168.93421(2)
70	Ytterbium	Yb	6	173.04(3)<ref name="fn_2" />
71	Lutetium	Lu	6, 3	174.967(1)<ref name="fn_2" />
72	Hafnium	Hf	6, 4	178.49(2)
73	Tantalum	Ta	6, 5	180.9479(1)
74	Tungsten	W	6, 6	183.84(1)
75	Rhenium	Re	6, 7	186.207(1)
76	Osmium	Os	6, 8	190.23(3)<ref name="fn_2" />
77	Iridium	Ir	6, 9	192.217(3)
78	Platinum	Pt	6, 10	195.084(9)
79	Gold	Au	6, 11	196.966569(4)
80	Mercury	Hg	6, 12	200.59(2)
81	Thallium	Tl	6, 13	204.3833(2)
82	Lead	Pb	6, 14	207.2(1)<ref name="fn_2" /> <ref name="fn_4" />
83	Bismuth	Bi	6, 15	208.98040(1)
84	Polonium	Po	6, 16	[208.9824]<ref name="fn_1" />
85	Astatine	At	6, 17	[209.9871]<ref name="fn_1" />
86	Radon	Rn	6, 18	[222.0176]<ref name="fn_1" />
87	Francium	Fr	7, 1	[223.0197]<ref name="fn_1" />
88	Radium	Ra	7, 2	[226.0254]<ref name="fn_1" />
89	Actinium	Ac	7	[227.0278]<ref name="fn_1" />
90	Thorium	Th	7	232.03806(2)<ref name="fn_1" /> <ref name="fn_2" />
91	Protactinium	Pa	7	231.03588(2)<ref name="fn_1" />
92	Uranium	U	7	238.02891(3)<ref name="fn_1" /> <ref name="fn_2" /> <ref name="fn_3" />
93	Neptunium	Np	7	[237.0482]<ref name="fn_1" />
94	Plutonium	Pu	7	[244.0642]<ref name="fn_1" />
95	Americium	Am	7	[243.0614]<ref name="fn_1" />
96	Curium	Cm	7	[247.0703]<ref name="fn_1" />
97	Berkelium	Bk	7	[247.0703]<ref name="fn_1" />
98	Californium	Cf	7	[251.0796]<ref name="fn_1" />
99	Einsteinium	Es	7	[252.0829]<ref name="fn_1" />
100	Fermium	Fm	7	[257.0951]<ref name="fn_1" />
101	Mendelevium	Md	7	[258.0986]<ref name="fn_1" />
102	Nobelium	No	7	[259.1009]<ref name="fn_1" />
103	Lawrencium	Lr	7, 3	[260.1053]<ref name="fn_1" />
104	Rutherfordium	Rf	7, 4	[261.1087]<ref name="fn_1" />
105	Dubnium	Db	7, 5	[262.1138]<ref name="fn_1" />
106	Seaborgium	Sg	7, 6	[263.1182]<ref name="fn_1" />
107	Bohrium	Bh	7, 7	[262.1229]<ref name="fn_1" />
108	Hassium	Hs	7, 8	[265]<ref name="fn_1" />
109	Meitnerium	Mt	7, 9	[266]<ref name="fn_1" />
110	Darmstadtium	Ds	7, 10	[269]<ref name="fn_1" />
111	Roentgenium	Rg	7, 11	[272]<ref name="fn_1" />
112	Ununbium	Uub	7, 12	[285]<ref name="fn_1" />
113	Ununtrium	Uut	7, 13	[284]<ref name="fn_1" />
114	Ununquadium	Uuq	7, 14	[289]<ref name="fn_1" />
115	Ununpentium	Uup	7, 15	[288]<ref name="fn_1" />
116	Ununhexium	Uuh	7, 16	[292]<ref name="fn_1" />
117	Ununseptium	Uus	7, 17	<ref>This element has not been discovered.</ref>
118	Ununoctium	Uuo	7, 18	[294]<ref name="fn_1" />

**Chemical series of the periodic table**
Alkali metals	Alkaline earth metals	Lanthanides	Actinides	Transition metals
Poor metals	Metalloids	Nonmetals	Halogens	Noble gases

[edit] Notes

[edit] 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.

Periodic tables
Standard table \| Vertical table \| Table with names \| Names and atomic masses (large) \| Names and atomic masses (small) \| Names and atomic masses (text only) \| Inline F-block \| Elements to 218 \| Electron configurations \| Metals and nonmetals \| Table by blocks \| Alternatives
Lists of elements
Name \| Atomic symbol \| Atomic number \| Boiling point \| Melting point \| Density \| Atomic mass
Groups: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18
Periods: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9
Series: Alkalis - Alkaline earths - Lanthanides - Actinides - Transition metals - Poor metals - Metalloids - Nonmetals - Halogens - Noble gases
Blocks: s-block - p-block - d-block - f-block - g-block