Elements: Atomic Mass Items

All 118 items · Atomic mass

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#NameAtomic mass

1
Hydrogen
Symbol H · Standard atomic weight
1.008 u
2
Helium
Symbol He · Standard atomic weight
4.003 u
3
Lithium
Symbol Li · Standard atomic weight
6.94 u
4
Beryllium
Symbol Be · Standard atomic weight
9.012 u
5
Boron
Symbol B · Standard atomic weight
10.81 u
6
Carbon
Symbol C · Standard atomic weight
12.01 u
7
Nitrogen
Symbol N · Standard atomic weight
14.01 u
8
Oxygen
Symbol O · Standard atomic weight
16.00 u
9
Fluorine
Symbol F · Standard atomic weight
19.00 u
10
Neon
Symbol Ne · Standard atomic weight
20.18 u
11
Sodium
Symbol Na · Standard atomic weight
22.99 u
12
Magnesium
Symbol Mg · Standard atomic weight
24.31 u
13
Aluminium
Symbol Al · Standard atomic weight
26.98 u
14
Silicon
Symbol Si · Standard atomic weight
28.09 u
15
Phosphorus
Symbol P · Standard atomic weight
30.97 u
16
Sulfur
Symbol S · Standard atomic weight
32.06 u
17
Chlorine
Symbol Cl · Standard atomic weight
35.45 u
18
Argon
Symbol Ar · Standard atomic weight
39.95 u
19
Potassium
Symbol K · Standard atomic weight
39.10 u
20
Calcium
Symbol Ca · Standard atomic weight
40.08 u
21
Scandium
Symbol Sc · Standard atomic weight
44.96 u
22
Titanium
Symbol Ti · Standard atomic weight
47.88 u
23
Vanadium
Symbol V · Standard atomic weight
50.94 u
24
Chromium
Symbol Cr · Standard atomic weight
52.00 u
25
Manganese
Symbol Mn · Standard atomic weight
54.94 u
26
Iron
Symbol Fe · Standard atomic weight
55.85 u
27
Cobalt
Symbol Co · Standard atomic weight
58.93 u
28
Nickel
Symbol Ni · Standard atomic weight
58.69 u
29
Copper
Symbol Cu · Standard atomic weight
63.55 u
30
Zinc
Symbol Zn · Standard atomic weight
65.39 u
31
Gallium
Symbol Ga · Standard atomic weight
69.72 u
32
Germanium
Symbol Ge · Standard atomic weight
72.64 u
33
Arsenic
Symbol As · Standard atomic weight
74.92 u
34
Selenium
Symbol Se · Standard atomic weight
78.96 u
35
Bromine
Symbol Br · Standard atomic weight
79.90 u
36
Krypton
Symbol Kr · Standard atomic weight
83.79 u
37
Rubidium
Symbol Rb · Standard atomic weight
85.47 u
38
Strontium
Symbol Sr · Standard atomic weight
87.62 u
39
Yttrium
Symbol Y · Standard atomic weight
88.91 u
40
Zirconium
Symbol Zr · Standard atomic weight
91.22 u
41
Niobium
Symbol Nb · Standard atomic weight
92.91 u
42
Molybdenum
Symbol Mo · Standard atomic weight
95.96 u
43
Technetium
Symbol Tc · Parenthesized mass number
(98) u
44
Ruthenium
Symbol Ru · Standard atomic weight
101.1 u
45
Rhodium
Symbol Rh · Standard atomic weight
102.9 u
46
Palladium
Symbol Pd · Standard atomic weight
106.4 u
47
Silver
Symbol Ag · Standard atomic weight
107.9 u
48
Cadmium
Symbol Cd · Standard atomic weight
112.4 u
49
Indium
Symbol In · Standard atomic weight
114.8 u
50
Tin
Symbol Sn · Standard atomic weight
118.7 u
51
Antimony
Symbol Sb · Standard atomic weight
121.8 u
52
Tellurium
Symbol Te · Standard atomic weight
127.6 u
53
Iodine
Symbol I · Standard atomic weight
126.9 u
54
Xenon
Symbol Xe · Standard atomic weight
131.3 u
55
Caesium
Symbol Cs · Standard atomic weight
132.9 u
56
Barium
Symbol Ba · Standard atomic weight
137.3 u
57
Lanthanum
Symbol La · Standard atomic weight
138.9 u
58
Cerium
Symbol Ce · Standard atomic weight
140.1 u
59
Praseodymium
Symbol Pr · Standard atomic weight
140.9 u
60
Neodymium
Symbol Nd · Standard atomic weight
144.2 u
61
Promethium
Symbol Pm · Parenthesized mass number
(145) u
62
Samarium
Symbol Sm · Standard atomic weight
150.4 u
63
Europium
Symbol Eu · Standard atomic weight
152.0 u
64
Gadolinium
Symbol Gd · Standard atomic weight
157.2 u
65
Terbium
Symbol Tb · Standard atomic weight
158.9 u
66
Dysprosium
Symbol Dy · Standard atomic weight
162.5 u
67
Holmium
Symbol Ho · Standard atomic weight
164.9 u
68
Erbium
Symbol Er · Standard atomic weight
167.3 u
69
Thulium
Symbol Tm · Standard atomic weight
168.9 u
70
Ytterbium
Symbol Yb · Standard atomic weight
173.0 u
71
Lutetium
Symbol Lu · Standard atomic weight
175.0 u
72
Hafnium
Symbol Hf · Standard atomic weight
178.5 u
73
Tantalum
Symbol Ta · Standard atomic weight
180.9 u
74
Tungsten
Symbol W · Standard atomic weight
183.9 u
75
Rhenium
Symbol Re · Standard atomic weight
186.2 u
76
Osmium
Symbol Os · Standard atomic weight
190.2 u
77
Iridium
Symbol Ir · Standard atomic weight
192.2 u
78
Platinum
Symbol Pt · Standard atomic weight
195.1 u
79
Gold
Symbol Au · Standard atomic weight
197.0 u
80
Mercury
Symbol Hg · Standard atomic weight
200.5 u
81
Thallium
Symbol Tl · Standard atomic weight
204.38 u
82
Lead
Symbol Pb · Standard atomic weight
207.2 u
83
Bismuth
Symbol Bi · Standard atomic weight
209.0 u
84
Polonium
Symbol Po · Parenthesized mass number
(209) u
85
Astatine
Symbol At · Parenthesized mass number
(210) u
86
Radon
Symbol Rn · Parenthesized mass number
(222) u
87
Francium
Symbol Fr · Parenthesized mass number
(223) u
88
Radium
Symbol Ra · Parenthesized mass number
(226) u
89
Actinium
Symbol Ac · Parenthesized mass number
(227) u
90
Thorium
Symbol Th · Standard atomic weight
232.0 u
91
Protactinium
Symbol Pa · Standard atomic weight
231.0 u
92
Uranium
Symbol U · Standard atomic weight
238.0 u
93
Neptunium
Symbol Np · Parenthesized mass number
(237) u
94
Plutonium
Symbol Pu · Parenthesized mass number
(244) u
95
Americium
Symbol Am · Parenthesized mass number
(243) u
96
Curium
Symbol Cm · Parenthesized mass number
(247) u
97
Berkelium
Symbol Bk · Parenthesized mass number
(247) u
98
Californium
Symbol Cf · Parenthesized mass number
(251) u
99
Einsteinium
Symbol Es · Parenthesized mass number
(252) u
100
Fermium
Symbol Fm · Parenthesized mass number
(257) u
101
Mendelevium
Symbol Md · Parenthesized mass number
(258) u
102
Nobelium
Symbol No · Parenthesized mass number
(259) u
103
Lawrencium
Symbol Lr · Parenthesized mass number
(262) u
104
Rutherfordium
Symbol Rf · Parenthesized mass number
(265) u
105
Dubnium
Symbol Db · Parenthesized mass number
(268) u
106
Seaborgium
Symbol Sg · Parenthesized mass number
(271) u
107
Bohrium
Symbol Bh · Parenthesized mass number
(270) u
108
Hassium
Symbol Hs · Parenthesized mass number
(277) u
109
Meitnerium
Symbol Mt · Parenthesized mass number
(276) u
110
Darmstadtium
Symbol Ds · Parenthesized mass number
(281) u
111
Roentgenium
Symbol Rg · Parenthesized mass number
(280) u
112
Copernicium
Symbol Cn · Parenthesized mass number
(285) u
113
Nihonium
Symbol Nh · Parenthesized mass number
(284) u
114
Flerovium
Symbol Fl · Parenthesized mass number
(289) u
115
Moscovium
Symbol Mc · Parenthesized mass number
(288) u
116
Livermorium
Symbol Lv · Parenthesized mass number
(293) u
117
Tennessine
Symbol Ts · Parenthesized mass number
(294) u
118
Oganesson
Symbol Og · Parenthesized mass number
(294) u