The mass of an atom is known as its atomic mass (ma or m). Although the kilogram (symbol: kg) is the SI measure of mass, the unified atomic mass unit (symbol: Da) is frequently used to express atomic mass (u). An unbound carbon-12 atom in its ground state has a mass of 112 of a Da. Nearly all of an atom's mass is made up of its protons and neutrons, with only a small amount of the mass coming from its electrons and nuclear binding energy. As a result, the atomic mass expressed in daltons has a value that is very similar to the mass number.
Atomic Mass of all Elements
|
Atomic No |
Name |
Symbol |
Atomic Mass |
|
1 |
H |
1.008 |
|
|
2 |
He |
4.2026 |
|
|
3 |
Li |
7 |
|
|
4 |
Be |
9.0121 |
|
|
5 |
B |
10.81 |
|
|
6 |
C |
12.011 |
|
|
7 |
N |
14.007 |
|
|
8 |
O |
15.999 |
|
|
9 |
F |
18.998 |
|
|
10 |
Ne |
20.18 |
|
|
11 |
Na |
22.98 |
|
|
12 |
Mg |
24.305 |
|
|
13 |
Al |
26.981 |
|
|
14 |
Si |
28.085 |
|
|
15 |
P |
30.973 |
|
|
16 |
S |
32.07 |
|
|
17 |
Cl |
35.45 |
|
|
18 |
Ar |
39.9 |
|
|
19 |
K |
39.098 |
|
|
20 |
Ca |
40.08 |
|
|
21 |
Sc |
44.955 |
|
|
22 |
Ti |
47.87 |
|
|
23 |
V |
50.941 |
|
|
24 |
Cr |
51.996 |
|
|
25 |
Mn |
54.938 |
|
|
26 |
Fe |
55.84 |
|
|
27 |
Co |
58.933 |
|
|
28 |
Ni |
58.693 |
|
|
29 |
Cu |
63.55 |
|
|
30 |
Zn |
65.4 |
|
|
31 |
Ga |
69.72 |
|
|
32 |
Ge |
72.63 |
|
|
33 |
As |
74.921 |
|
|
34 |
Se |
78.97 |
|
|
35 |
Br |
79.9 |
|
|
36 |
Kr |
83.8 |
|
|
37 |
Rb |
85.468 |
|
|
38 |
Sr |
87.6 |
|
|
39 |
Y |
88.90 |
|
|
40 |
Zr |
91.22 |
|
|
41 |
Nb |
92.906 |
|
|
42 |
Mo |
96 |
|
|
43 |
Tc |
96.906 |
|
|
44 |
Ru |
101.1 |
|
|
45 |
Rh |
102.90 |
|
|
46 |
Pd |
106.4 |
|
|
47 |
Ag |
107.868 |
|
|
48 |
Cd |
112.41 |
|
|
49 |
In |
114.82 |
|
|
50 |
Sn |
118.71 |
|
|
51 |
Sb |
121.76 |
|
|
52 |
Te |
127.6 |
|
|
53 |
I |
126.90 |
|
|
54 |
Xe |
131.29 |
|
|
55 |
Cs |
132.905 |
|
|
56 |
Ba |
137.33 |
|
|
57 |
La |
138.90 |
|
|
58 |
Ce |
140.12 |
|
|
59 |
Pr |
140.907 |
|
|
60 |
Nd |
144.24 |
|
|
61 |
Pm |
144.912 |
|
|
62 |
Sm |
150.4 |
|
|
63 |
Eu |
151.96 |
|
|
64 |
Gd |
157.2 |
|
|
65 |
Tb |
158.925 |
|
|
66 |
Dy |
162.5 |
|
|
67 |
Ho |
164.93 |
|
|
68 |
Er |
167.26 |
|
|
69 |
Tm |
168.934 |
|
|
70 |
Yb |
173 |
|
|
71 |
Lu |
174.967 |
|
|
72 |
Hf |
178.49 |
|
|
73 |
Ta |
180.947 |
|
|
74 |
W |
183.8 |
|
|
75 |
Re |
186.21 |
|
|
76 |
Os |
190.2 |
|
|
77 |
Ir |
192.22 |
|
|
78 |
Pt |
195.08 |
|
|
79 |
Au |
196.96 |
|
|
80 |
Hg |
200.59 |
|
|
81 |
Tl |
204.383 |
|
|
82 |
Pb |
207.2 |
|
|
83 |
Bi |
208.98 |
|
|
84 |
Po |
208.98 |
|
|
85 |
At |
209.987 |
|
|
86 |
Rn |
222.0175 |
|
|
87 |
Fr |
223.0197 |
|
|
88 |
Ra |
226.025 |
|
|
89 |
Ac |
227.027 |
|
|
90 |
Th |
232.038 |
|
|
91 |
Pa |
231.03 |
|
|
92 |
U |
238.028 |
|
|
93 |
Np |
237.048 |
|
|
94 |
Pu |
244.06 |
|
|
95 |
Am |
243.06 |
|
|
96 |
Cm |
247.07 |
|
|
97 |
Bk |
247.07 |
|
|
98 |
Cf |
251.079 |
|
|
99 |
Es |
252.083 |
|
|
100 |
Fm |
257.095 |
|
|
101 |
Md |
258.098 |
|
|
102 |
No |
259.101 |
|
|
103 |
Lr |
266.12 |
|
|
104 |
Rf |
267.122 |
|
|
105 |
Db |
268.126 |
|
|
106 |
Sg |
269.128 |
|
|
107 |
Bh |
270.133 |
|
|
108 |
Hs |
269.134 |
|
|
109 |
Mt |
277.154 |
|
|
110 |
Ds |
282.166 |
|
|
111 |
Rg |
282.169 |
|
|
112 |
Cn |
286.179 |
|
|
113 |
Nh |
286.182 |
|
|
114 |
Fl |
290.192 |
|
|
115 |
Mc |
290.196 |
|
|
116 |
Lv |
293.205 |
|
|
117 |
Ts |
294.211 |
|
|
118 |
Og |
295.216 |
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. Although the kilogram (symbol: kg) is the SI measure of mass, the unified atom…){kind=link}
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