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Ðßíáêåò Áôïìïêþí Âáñþí
ÐÉÍÁÊÁÓ ÔÙÍ ÓÔÏÉ×ÅÉÙÍ (Ìå âÜóç ôïí Áôïìéêü Áñéèìü)
Æ Óýìâïëï ¼íïìá Áôïìéêü âÜñïò Óçìåéþóåéò
1 H Hydrogen 1.00794(7) 1, 2, 3
2 He Helium 4.002602(2) 1, 2
3 Li Lithium 6.941(2) 1, 2, 3, 4
4 Be Beryllium 9.012182(3)
5 B Boron 10.811(7) 1, 2, 3
6 C Carbon 12.0107(8) 1, 2
7 N Nitrogen 14.00674(7) 1, 2
8 O Oxygen 15.9994(3) 1, 2
9 F Fluorine 18.9984032(9)
10 Ne Neon 20.1797(6) 1, 3
11 Na Sodium 22.989768(6)
12 Mg Magnesium 24.3050(6)
13 Al Aluminium 26.981539(5)
14 Si Silicon 28.0855(3) 2
15 P Phosphorus 30.973762(4)
16 S Sulfur 32.066(6) 1, 2
17 Cl Chlorine 35.4527(9) 3
18 Ar Argon 39.948(1) 1, 2
19 K Potassium 39.0983(1) 1
20 Ca Calcium 40.078(4) 1
21 Sc Scandium 44.955910(9)
22 Ti Titanium 47.867(1)
23 V Vanadium 50.9415(1)
24 Cr Chromium 51.9961(6)
25 Mn Manganese 54.93805(1)
26 Fe Iron 55.845(2)
27 Co Cobalt 58.93320(1)
28 Ni Nickel 58.6934(2)
29 Cu Copper 63.546(3) 2
30 Zn Zinc 65.39(2)
31 Ga Gallium 69.723(1)
32 Ge Germanium 72.61(2)
33 As Arsenic 74.92159(2)
34 Se Selenium 78.96(3)
35 Br Bromine 79.904(1)
36 Kr Krypton 83.80(1) 1, 3
37 Rb Rubidium 85.4678(3) 1
38 Sr Strontium 87.62(1) 1, 2
39 Y Yttrium 88.90585(2)
40 Zr Zirconium 91.224(2) 1
41 Nb Niobium 92.90638(2)
42 Mo Molybdenum 95.94(1) 1
43 Tc Technetium [98] 5
44 Ru Ruthenium 101.07(2) 1
45 Rh Rhodium 102.90550(3)
46 Pd Palladium 106.42(1) 1
47 Ag Silver 107.8682(2) 1
48 Cd Cadmium 112.411(8) 1
49 In Indium 114.818(3)
50 Sn Tin 118.710(7) 1
51 Sb Antimony 121.760(1) 1
52 Te Tellurium 127.60(3) 1
53 I Iodine 126.90447(3)
54 Xe Xenon 131.29(2) 1, 3
55 Cs Caesium 132.90543(5)
56 Ba Barium 137.327(7)
57 La Lanthanum 138.9055(2) 1
58 Ce Cerium 140.116(1) 1
59 Pr Praseodymium 140.90765(3)
60 Nd Neodymium 144.24(3) 1
61 Pm Promethium [145] 5
62 Sm Samarium 150.36(3) 1
63 Eu Europium 151.964(1) 1
64 Gd Gadolinium 157.25(3) 1
65 Tb Terbium 158.92534(3)
66 Dy Dysprosium 162.50(3) 1
67 Ho Holmium 164.93032(3)
68 Er Erbium 167.26(3) 1
69 Tm Thulium 168.93421(3)
70 Yb Ytterbium 173.04(3) 1
71 Lu Lutetium 174.967(1) 1
72 Hf Hafnium 178.49(2)
73 Ta Tantalum 180.9479(1)
74 W Tungsten 183.84(1)
75 Re Rhenium 186.207(1)
76 Os Osmium 190.23(3) 1
77 Ir Iridium 192.217(3)
78 Pt Platinum 195.078(2)
79 Au Gold 196.96654(3)
80 Hg Mercury 200.59(2)
81 Tl Thallium 204.3833(2)
82 Pb Lead 207.2(1) 1, 2
83 Bi Bismuth 208.98037(3)
84 Po Polonium [209] 5
85 At Astatine [210] 5
86 Rn Radon [222] 5
87 Fr Francium [223] 5
88 Ra Radium [226] 5
89 Ac Actinium [227] 5
90 Th Thorium 232.0381(1) 1, 5
91 Pa Protactinium 231.03588(2) 5
92 U Uranium 238.0289(1) 1, 3, 5
93 Np Neptunium [237] 5
94 Pu Plutonium [244] 5
95 Am Americium [243] 5
96 Cm Curium [247] 5
97 Bk Berkelium [247] 5
98 Cf Californium [251] 5
99 Es Einsteinium [252] 5
100 Fm Fermium [257] 5
101 Md Mendelevium [258] 5
102 No Nobelium [259] 5
103 Lr Lawrencium [262] 5
104 Unq Unnilquadium [261] 5, 6
105 Unp Unnilpentium [262] 5, 6
106 Unh Unnilhexium [263] 5, 6
107 Uns Unnilseptium [262] 5, 6
108 Uno Unniloctium [265] 5, 6
109 Une Unnilennium [266] 5, 6
ÐÉÍÁÊÁÓ ÔÙÍ ÓÔÏÉ×ÅÉÙÍ (Ìå ÁëöáâçôéêÞ óåéñÜ)
Æ Óýìâïëï ¼íïìá Áôïìéêü âÜñïò Óçìåéþóåéò
89 Ac Actinium [227] 5
13 Al Aluminium 26.981539(5)
95 Am Americium [243] 5
51 Sb Antimony 121.760(1) 1
18 Ar Argon 39.948(1) 1, 2
33 As Arsenic 74.92159(2)
85 At Astatine [210] 5
56 Ba Barium 137.327(7)
97 Bk Berkelium [247] 5
4 Be Beryllium 9.012182(3)
83 Bi Bismuth 208.98037(3)
5 B Boron 10.811(7) 1, 2, 3
35 Br Bromine 79.904(1)
48 Cd Cadmium 112.411(8) 1
55 Cs Caesium 132.90543(5)
20 Ca Calcium 40.078(4) 1
98 Cf Californium [251] 5
6 C Carbon 12.0107(8) 1, 2
58 Ce Cerium 140.116(1) 1
17 Cl Chlorine 35.4527(9) 3
24 Cr Chromium 51.9961(6)
27 Co Cobalt 58.93320(1)
29 Cu Copper 63.546(3) 2
96 Cm Curium [247] 5
66 Dy Dysprosium 162.50(3) 1
99 Es Einsteinium [252] 5
68 Er Erbium 167.26(3) 1
63 Eu Europium 151.964(1) 1
100 Fm Fermium [257] 5
9 F Fluorine 18.9984032(9)
87 Fr Francium [223] 5
64 Gd Gadolinium 157.25(3) 1
31 Ga Gallium 69.723(1)
32 Ge Germanium 72.61(2)
79 Au Gold 196.96654(3)
72 Hf Hafnium 178.49(2)
2 He Helium 4.002602(2) 1, 2
67 Ho Holmium 164.93032(3)
1 H Hydrogen 1.00794(7) 1, 2, 3
49 In Indium 114.818(3)
53 I Iodine 126.90447(3)
77 Ir Iridium 192.217(3)
26 Fe Iron 55.845(2)
36 Kr Krypton 83.80(1) 1, 3
57 La Lanthanum 138.9055(2) 1
103 Lr Lawrencium [262] 5
82 Pb Lead 207.2(1) 1, 2
3 Li Lithium 6.941(2) 1, 2, 3, 4
71 Lu Lutetium 174.967(1) 1
12 Mg Magnesium 24.3050(6)
25 Mn Manganese 54.93805(1)
101 Md Mendelevium [258] 5
80 Hg Mercury 200.59(2)
42 Mo Molybdenum 95.94(1) 1
60 Nd Neodymium 144.24(3) 1
10 Ne Neon 20.1797(6) 1, 3
93 Np Neptunium [237] 5
28 Ni Nickel 58.6934(2)
41 Nb Niobium 92.90638(2)
7 N Nitrogen 14.00674(7) 1, 2
102 No Nobelium [259] 5
76 Os Osmium 190.23(3) 1
8 O Oxygen 15.9994(3) 1, 2
46 Pd Palladium 106.42(1) 1
15 P Phosphorus 30.973762(4)
78 Pt Platinum 195.078(2)
94 Pu Plutonium [244] 5
84 Po Polonium [209] 5
19 K Potassium 39.0983(1) 1
59 Pr Praseodymium 140.90765(3)
61 Pm Promethium [145] 5
91 Pa Protactinium 231.03588(2) 5
88 Ra Radium [226] 5
86 Rn Radon [222] 5
75 Re Rhenium 186.207(1)
45 Rh Rhodium 102.90550(3)
37 Rb Rubidium 85.4678(3) 1
44 Ru Ruthenium 101.07(2) 1
62 Sm Samarium 150.36(3) 1
21 Sc Scandium 44.955910(9)
34 Se Selenium 78.96(3)
14 Si Silicon 28.0855(3) 2
47 Ag Silver 107.8682(2) 1
11 Na Sodium 22.989768(6)
38 Sr Strontium 87.62(1) 1, 2
16 S Sulfur 32.066(6) 1, 2
73 Ta Tantalum 180.9479(1)
43 Tc Technetium [98] 5
52 Te Tellurium 127.60(3) 1
65 Tb Terbium 158.92534(3)
81 Tl Thallium 204.3833(2)
90 Th Thorium 232.0381(1) 1, 5
69 Tm Thulium 168.93421(3)
50 Sn Tin 118.710(7) 1
22 Ti Titanium 47.867(1)
74 W Tungsten 183.84(1)
92 U Uranium 238.0289(1) 1, 3, 5
23 V Vanadium 50.9415(1)
109 Une Unnilennium [266] 5, 6
106 Unh Unnilhexium [263] 5, 6
108 Uno Unniloctium [265] 5, 6
105 Unp Unnilpentium [262] 5, 6
104 Unq Unnilquadium [261] 5, 6
107 Uns Unnilseptium [262] 5, 6
54 Xe Xenon 131.29(2) 1, 3
70 Yb Ytterbium 173.04(3) 1
39 Y Yttrium 88.90585(2)
30 Zn Zinc 65.39(2)
40 Zr Zirconium 91.224(2) 1
-
Geological specimens are known in which the element has an isotopic composition
outside the limits for normal material. The difference between the atomic
weight of the element in such specimens and that given in the Table may
exceed the stated uncertainty.
-
Range in isotopic composition of normal terrestrial material prevents a
more precise value being given; the tabulated value should be applicable
to any normal material.
-
Modified isotopic compositions may be found in commercially available material
because it has been subject to an undisclosed or inadvertant isotopic fractionation.
Substantial deviations in atomic weight of the element from that given
in the Table can occur.
-
Commercially available Li materials have atomic weights that range between
6.94 and 6.99; if a more accurate value is required, it must be determined
for the specific material.
-
Element has no stable nuclides. The value enclosed in brackets, e.g. [209],
indicates the mass number of the longest-lived isotope of the element.
However three such elements (Th, Pa, and U) do have a characteristic terrestrial
isotopic composition, and for these an atomic weight is tabulated.
The names and symbols for elements 104-112 are under review. Proposals
have been published in Pure Appl. Chem., 66, 2419-2421 (1994) but these
are not definitive and may change [See back inside cover of Pure Appl.
Chem., 68 (1996) issues 1, 2, 4 and 5 and a discussion of this problem.].
The temporary system recommended by J Chatt, Pure Appl. Chem., 51, 381-384
(1979) is used above.
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