List of elements by atomic mass

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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. The number in parenthesis gives the uncertainty in the "concise notation" defined in the [IUPAC] reference "whereby standard uncertainty is given in parenthesis next to the least significant digits to which it applies", e.g., 1.00794(7) stands for 1.00794 ± 0.00007. For artificial elements the nucleon count of the most stable isotope is listed brackets [] as the atomic mass.
Atomic Number Name Symbol Atomic Mass Group Period

1 Hydrogen H ³ ⁴ 1 1
2 Helium He ⁴ 18 1
3 Lithium Li ³ ⁴ ⁵ 1 2
4 Beryllium Be 9.012182(3) 2 2
5 Boron B ³ ⁴ 13 2
6 Carbon C ⁴ 14 2
7 Nitrogen N ⁴ 15 2
8 Oxygen O ⁴ 16 2
9 Fluorine F 18.9984032(5) 17 2
10 Neon Ne ³ 18 2
11 Sodium (Natrium) Na 22.98976928(2) 1 3
12 Magnesium Mg 24.3050(6) 2 3
13 Aluminium (Aluminum) Al 26.9815386(8) 13 3
14 Silicon Si 14 3
15 Phosphorus P 30.973762(2) 15 3
16 Sulfur S ⁴ 16 3
17 Chlorine Cl ³ ⁴ 17 3
19 Potassium (Kalium) K 39.0983(1) 1 4
18 Argon Ar ⁴ 18 3
20 Calcium Ca 2 4
21 Scandium Sc 44.955912(6) 3 4
22 Titanium Ti 47.867(1) 4 4
23 Vanadium V 50.9415(1) 5 4
24 Chromium Cr 51.9961(6) 6 4
25 Manganese Mn 54.938045(5) 7 4
26 Iron (Ferrum) Fe 55.845(2) 8 4
27 Cobalt Co 58.933195(5) 9 4
28 Nickel Ni 58.6934(2) 10 4
29 Copper (Cuprum) Cu 11 4
30 Zinc Zn 65.409(4) 12 4
31 Gallium Ga 69.723(1) 13 4
32 Germanium Ge 72.64(1) 14 4
33 Arsenic As 74.92160(2) 15 4
34 Selenium Se 16 4
35 Bromine Br 79.904(1) 17 4
36 Krypton Kr ³ 18 4
37 Rubidium Rb 1 5
38 Strontium Sr ⁴ 2 5
39 Yttrium Y 88.90585(2) 3 5
40 Zirconium Zr 4 5
41 Niobium Nb 92.906 38(2) 5 5
42 Molybdenum Mo 6 5
43 Technetium Tc 7 5
44 Ruthenium Ru 8 5
45 Rhodium Rh 102.905 50(2) 9 5
46 Palladium Pd 10 5
47 Silver (Argentum) Ag 11 5
48 Cadmium Cd 12 5
49 Indium In 114.818(3) 13 5
50 Tin (Stannum) Sn 14 5
51 Antimony (Stibium) Sb 15 5
52 Tellurium Te 16 5
53 Iodine I 126.904 47(3) 17 5
54 Xenon Xe ³ 18 5
55 Caesium (Cesium) Cs 132.9054519(2) 1 6
56 Barium Ba 137.327(7) 2 6
57 Lanthanum La n/a 6
58 Cerium Ce n/a 6
59 Praseodymium Pr 140.90765(2) n/a 6
60 Neodymium Nd n/a 6
61 Promethium Pm n/a 6
62 Samarium Sm n/a 6
63 Europium Eu n/a 6
64 Gadolinium Gd n/a 6
65 Terbium Tb 158.92535(2) n/a 6
66 Dysprosium Dy n/a 6
67 Holmium Ho 164.930 32(2) n/a 6
68 Erbium Er n/a 6
69 Thulium Tm 168.93421(2) n/a 6
70 Ytterbium Yb n/a 6
71 Lutetium Lu 3 6
72 Hafnium Hf 178.49(2) 4 6
73 Tantalum Ta 180.94788(2) 5 6
74 Tungsten (Wolfram) W 183.84(1) 6 6
75 Rhenium Re 186.207(1) 7 6
76 Osmium Os 8 6
77 Iridium Ir 192.217(3) 9 6
78 Platinum Pt 195.084(9) 10 6
79 Gold (Aurum) Au 196.966569(4) 11 6
80 Mercury (Hydrargyrum) Hg 200.59(2) 12 6
81 Thallium Tl 204.3833(2) 13 6
82 Lead (Plumbum) Pb ⁴ 14 6
83 Bismuth Bi 208.98040(1) 15 6
84 Polonium Po 16 6
85 Astatine At 17 6
86 Radon Rn 18 6
87 Francium Fr 1 7
88 Radium Ra 2 7
89 Actinium Ac n/a 7
91 Protactinium Pa n/a 7
90 Thorium Th ² n/a 7
93 Neptunium Np n/a 7
92 Uranium U ² ³ n/a 7
95 Americium Am n/a 7
94 Plutonium Pu n/a 7
96 Curium Cm n/a 7
97 Berkelium Bk n/a 7
98 Californium Cf n/a 7
99 Einsteinium Es n/a 7
100 Fermium Fm n/a 7
101 Mendelevium Md n/a 7
102 Nobelium No n/a 7
103 Lawrencium Lr 3 7
104 Rutherfordium Rf 4 7
105 Dubnium Db 5 7
106 Seaborgium Sg 6 7
107 Bohrium Bh 7 7
108 Hassium Hs 8 7
109 Meitnerium Mt 9 7
110 Darmstadtium Ds 10 7
111 Roentgenium Rg 11 7
112 Ununbium Uub 12 7
113 Ununtrium Uut 13 7
114 Ununquadium Uuq 14 7
115 Ununpentium Uup 15 7
116 Ununhexium Uuh 16 7
118 Ununoctium Uuo 18 7

Notes
Note 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. However, three elements, Thorium, Protactinium, and Uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given.
Note 2: The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
Note 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.
Note 4: The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
Note 5: 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.
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
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

Atomic Number	Name	Symbol	Atomic Mass	Group	Period
1	Hydrogen	H	³ ⁴	1	1
2	Helium	He	⁴	18	1
3	Lithium	Li	³ ⁴ ⁵	1	2
4	Beryllium	Be	9.012182(3)	2	2
5	Boron	B	³ ⁴	13	2
6	Carbon	C	⁴	14	2
7	Nitrogen	N	⁴	15	2
8	Oxygen	O	⁴	16	2
9	Fluorine	F	18.9984032(5)	17	2
10	Neon	Ne	³	18	2
11	Sodium (Natrium)	Na	22.98976928(2)	1	3
12	Magnesium	Mg	24.3050(6)	2	3
13	Aluminium (Aluminum)	Al	26.9815386(8)	13	3
14	Silicon	Si		14	3
15	Phosphorus	P	30.973762(2)	15	3
16	Sulfur	S	⁴	16	3
17	Chlorine	Cl	³ ⁴	17	3
19	Potassium (Kalium)	K	39.0983(1)	1	4
18	Argon	Ar	⁴	18	3
20	Calcium	Ca		2	4
21	Scandium	Sc	44.955912(6)	3	4
22	Titanium	Ti	47.867(1)	4	4
23	Vanadium	V	50.9415(1)	5	4
24	Chromium	Cr	51.9961(6)	6	4
25	Manganese	Mn	54.938045(5)	7	4
26	Iron (Ferrum)	Fe	55.845(2)	8	4
27	Cobalt	Co	58.933195(5)	9	4
28	Nickel	Ni	58.6934(2)	10	4
29	Copper (Cuprum)	Cu		11	4
30	Zinc	Zn	65.409(4)	12	4
31	Gallium	Ga	69.723(1)	13	4
32	Germanium	Ge	72.64(1)	14	4
33	Arsenic	As	74.92160(2)	15	4
34	Selenium	Se		16	4
35	Bromine	Br	79.904(1)	17	4
36	Krypton	Kr	³	18	4
37	Rubidium	Rb		1	5
38	Strontium	Sr	⁴	2	5
39	Yttrium	Y	88.90585(2)	3	5
40	Zirconium	Zr		4	5
41	Niobium	Nb	92.906 38(2)	5	5
42	Molybdenum	Mo		6	5
43	Technetium	Tc		7	5
44	Ruthenium	Ru		8	5
45	Rhodium	Rh	102.905 50(2)	9	5
46	Palladium	Pd		10	5
47	Silver (Argentum)	Ag		11	5
48	Cadmium	Cd		12	5
49	Indium	In	114.818(3)	13	5
50	Tin (Stannum)	Sn		14	5
51	Antimony (Stibium)	Sb		15	5
52	Tellurium	Te		16	5
53	Iodine	I	126.904 47(3)	17	5
54	Xenon	Xe	³	18	5
55	Caesium (Cesium)	Cs	132.9054519(2)	1	6
56	Barium	Ba	137.327(7)	2	6
57	Lanthanum	La		n/a	6
58	Cerium	Ce		n/a	6
59	Praseodymium	Pr	140.90765(2)	n/a	6
60	Neodymium	Nd		n/a	6
61	Promethium	Pm		n/a	6
62	Samarium	Sm		n/a	6
63	Europium	Eu		n/a	6
64	Gadolinium	Gd		n/a	6
65	Terbium	Tb	158.92535(2)	n/a	6
66	Dysprosium	Dy		n/a	6
67	Holmium	Ho	164.930 32(2)	n/a	6
68	Erbium	Er		n/a	6
69	Thulium	Tm	168.93421(2)	n/a	6
70	Ytterbium	Yb		n/a	6
71	Lutetium	Lu		3	6
72	Hafnium	Hf	178.49(2)	4	6
73	Tantalum	Ta	180.94788(2)	5	6
74	Tungsten (Wolfram)	W	183.84(1)	6	6
75	Rhenium	Re	186.207(1)	7	6
76	Osmium	Os		8	6
77	Iridium	Ir	192.217(3)	9	6
78	Platinum	Pt	195.084(9)	10	6
79	Gold (Aurum)	Au	196.966569(4)	11	6
80	Mercury (Hydrargyrum)	Hg	200.59(2)	12	6
81	Thallium	Tl	204.3833(2)	13	6
82	Lead (Plumbum)	Pb	⁴	14	6
83	Bismuth	Bi	208.98040(1)	15	6
84	Polonium	Po		16	6
85	Astatine	At		17	6
86	Radon	Rn		18	6
87	Francium	Fr		1	7
88	Radium	Ra		2	7
89	Actinium	Ac		n/a	7
91	Protactinium	Pa		n/a	7
90	Thorium	Th	²	n/a	7
93	Neptunium	Np		n/a	7
92	Uranium	U	² ³	n/a	7
95	Americium	Am		n/a	7
94	Plutonium	Pu		n/a	7
96	Curium	Cm		n/a	7
97	Berkelium	Bk		n/a	7
98	Californium	Cf		n/a	7
99	Einsteinium	Es		n/a	7
100	Fermium	Fm		n/a	7
101	Mendelevium	Md		n/a	7
102	Nobelium	No		n/a	7
103	Lawrencium	Lr		3	7
104	Rutherfordium	Rf		4	7
105	Dubnium	Db		5	7
106	Seaborgium	Sg		6	7
107	Bohrium	Bh		7	7
108	Hassium	Hs		8	7
109	Meitnerium	Mt		9	7
110	Darmstadtium	Ds		10	7
111	Roentgenium	Rg		11	7
112	Ununbium	Uub		12	7
113	Ununtrium	Uut		13	7
114	Ununquadium	Uuq		14	7
115	Ununpentium	Uup		15	7
116	Ununhexium	Uuh		16	7
118	Ununoctium	Uuo		18	7

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