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Periodic Table of Elements

Sorted by Atomic Mass Average

Mass	Name	Sym	#
1.00794	Hydrogen	H	1
4.002602	Helium	He	2
6.941	Lithium	Li	3
9.012182	Beryllium	Be	4
10.811	Boron	B	5
12.011	Carbon	C	6
14.00674	Nitrogen	N	7
15.9994	Oxygen	O	8
18.9984	Fluorine	F	9
20.1797	Neon	Ne	10
22.98977	Sodium	Na	11
24.305	Magnesium	Mg	12
26.98154	Aluminum	Al	13
28.0855	Silicon	Si	14
30.97376	Phosphorus	P	15
32.066	Sulfur	S	16
35.4527	Chlorine	Cl	17
39.0983	Potassium	K	19
39.948	Argon	Ar	18
40.078	Calcium	Ca	20
44.95591	Scandium	Sc	21
47.88	Titanium	Ti	22
50.9415	Vanadium	V	23
51.9961	Chromium	Cr	24
54.93805	Manganese	Mn	25
55.847	Iron	Fe	26
58.6934	Nickel	Ni	28
58.9332	Cobalt	Co	27
63.546	Copper	Cu	29
65.39	Zinc	Zn	30
69.723	Gallium	Ga	31
72.61	Germanium	Ge	32
74.92159	Arsenic	As	33
78.96	Selenium	Se	34
79.904	Bromine	Br	35
83.8	Krypton	Kr	36
85.4678	Rubidium	Rb	37
87.62	Strontium	Sr	38
88.90585	Yttrium	Y	39
91.224	Zirconium	Zr	40
92.90638	Niobium	Nb	41
95.94	Molybdenum	Mo	42
98	Technetium	Tc	43
101.07	Ruthenium	Ru	44
102.9055	Rhodium	Rh	45
106.42	Palladium	Pd	46
107.8682	Silver	Ag	47
112.411	Cadmium	Cd	48
114.818	Indium	In	49
118.71	Tin	Sn	50
121.757	Antimony	Sb	51
126.9045	Iodine	I	53
127.6	Tellurium	Te	52
131.29	Xenon	Xe	54
132.9054	Cesium	Cs	55
137.327	Barium	Ba	56
138.9055	Lanthanum	La	57
140.115	Cerium	Ce	58
140.9077	Praseodymium	Pr	59
144.24	Neodymium	Nd	60
145	Promethium	Pm	61
150.36	Samarium	Sm	62
151.965	Europium	Eu	63
157.25	Gadolinium	Gd	64
158.9253	Terbium	Tb	65
162.5	Dysprosium	Dy	66
164.9303	Holmium	Ho	67
167.26	Erbium	Er	68
168.9342	Thulium	Tm	69
173.04	Ytterbium	Yb	70
174.967	Lutetium	Lu	71
178.49	Hafnium	Hf	72
180.9479	Tantalum	Ta	73
183.85	Tungsten	W	74
186.207	Rhenium	Re	75
190.2	Osmium	Os	76
192.22	Iridium	Ir	77
195.08	Platinum	Pt	78
196.9665	Gold	Au	79
200.59	Mercury	Hg	80
204.3833	Thallium	Tl	81
207.2	Lead	Pb	82
208.9804	Bismuth	Bi	83
208.9824	Polonium	Po	84
209.9871	Astatine	At	85
213.0359	Protactinium	Pa	91
222	Radon	Rn	86
223	Francium	Fr	87
226.0254	Radium	Ra	88
227.0728	Actinium	Ac	89
232.0381	Thorium	Th	90
237.0482	Neptunium	Np	93
238.0289	Uranium	U	92
243.0614	Americium	Am	95
244.0642	Plutonium	Pu	94
247	Curium	Cm	96
247	Berkelium	Bk	97
251	Californium	Cf	98
252	Einsteinium	Es	99
257	Fermium	Fm	100
258	Mendelevium	Md	101
259	Nobelium	No	102
260	Lawrencium	Lr	103
261	Rutherfordium	Rf	104
262	Dubnium	Db	105
262	Bohrium	Bh	107
263	Seaborgium	Sg	106
265	Hassium	Hs	108
266	Meitnerium	Mt	109
271	Darmstadtium	Ds	110
272	Roentgenium	Rg	111

[Last Updated: 2/22/2007]

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