Chemical Elements
Periodic Number |
Symbol |
Name |
Avg. Mass |
Stable |
Known Isotopes |
Most Abundant Isotope |
1 |
H |
Hydrogen |
1.00794 |
yes |
6 |
1H |
2 |
He |
Helium |
4.002602 |
yes |
8 |
4He |
3 |
Li |
Lithium |
6.941 |
yes |
9 |
7Li |
4 |
Be |
Beryllium |
9.012182 |
yes |
10 |
9Be |
5 |
B |
Boron |
10.811 |
yes |
13 |
11B |
6 |
C |
Carbon |
12.0107 |
yes |
15 |
12C |
7 |
N |
Nitrogen |
14.0067 |
yes |
15 |
14N |
8 |
O |
Oxygen |
15.9994 |
yes |
15 |
16O |
9 |
F |
Fluorine |
18.9984032 |
yes |
16 |
19F |
10 |
Ne |
Neon |
20.1797 |
yes |
17 |
20Ne |
11 |
Na |
Sodium |
22.98977 |
yes |
18 |
23Na |
12 |
Mg |
Magnesium |
24.305 |
yes |
18 |
24Mg |
13 |
Al |
Aluminium |
26.981538 |
yes |
19 |
27Al |
14 |
Si |
Silicon |
28.0855 |
yes |
21 |
28Si |
15 |
P |
Phosphorus |
30.973761 |
yes |
23 |
31P |
16 |
S |
Sulfur |
32.065 |
yes |
24 |
32S |
17 |
Cl |
Chlorine |
35.453 |
yes |
24 |
35Cl |
18 |
Ar |
Argon |
39.948 |
yes |
24 |
40Ar |
19 |
K |
Potassium |
39.0983 |
yes |
24 |
39K |
20 |
Ca |
Calcium |
40.078 |
yes |
24 |
40Ca |
21 |
Sc |
Scandium |
44.95591 |
yes |
24 |
45Sc |
22 |
Ti |
Titanium |
47.867 |
yes |
24 |
48Ti |
23 |
V |
Vanadium |
50.9415 |
yes |
24 |
51V |
24 |
Cr |
Chromium |
51.9961 |
yes |
24 |
52Cr |
25 |
Mn |
Manganese |
54.938049 |
yes |
24 |
55Mn |
26 |
Fe |
Iron |
55.845 |
yes |
25 |
56Fe |
27 |
Co |
Cobalt |
58.9332 |
yes |
25 |
59Co |
28 |
Ni |
Nickel |
58.6934 |
yes |
29 |
58Ni |
29 |
Cu |
Copper |
63.546 |
yes |
29 |
63Cu |
30 |
Zn |
Zinc |
58.6934 |
yes |
29 |
64Zn |
31 |
Ga |
Gallium |
69.7236 |
yes |
29 |
69Ga |
32 |
Ge |
Germanium |
72.64 |
yes |
29 |
74Ge |
33 |
As |
Arsenic |
74.9216 |
yes |
30 |
75As |
34 |
Se |
Selenium |
78.96 |
yes |
28 |
80Se |
35 |
Br |
Bromine |
79.904 |
yes |
28 |
79Br |
36 |
Kr |
Krypton |
83.798 |
yes |
29 |
84Kr |
37 |
Rb |
Rubidium |
85.4678 |
yes |
32 |
85Rb |
38 |
Sr |
Strontium |
87.62 |
yes |
32 |
86Sr |
39 |
Y |
Yttrium |
88.90585 |
yes |
30 |
89Y |
40 |
Zr |
Zirconium |
91.224 |
yes |
30 |
90Zr |
41 |
Nb |
Niobium |
92.90638 |
yes |
30 |
93Nb |
42 |
Mo |
Molybdenum |
95.94 |
yes |
31 |
98Mo |
43 |
Tc |
Technetium |
98.0 |
no |
31 |
- |
44 |
Ru |
Ruthenium |
101.07 |
yes |
32 |
102Ru |
45 |
Rh |
Rhodium |
102.9055 |
yes |
33 |
103Rh |
46 |
Pd |
Palladium |
106.42 |
yes |
33 |
106Pd |
47 |
Ag |
Silver |
107.8682 |
yes |
34 |
107Ag |
48 |
Cd |
Cadmium |
112.411 |
yes |
35 |
114Cd |
49 |
In |
Indium |
114.818 |
yes |
37 |
115In |
50 |
Sn |
Tin |
118.71 |
yes |
38 |
120Sn |
51 |
Sb |
Antimony |
121.76 |
yes |
37 |
121Sb |
52 |
Te |
Tellurium |
127.6 |
yes |
37 |
130Te |
53 |
I |
Iodine |
126.90447 |
yes |
37 |
127I |
54 |
Xe |
Xenon |
131.293 |
yes |
38 |
132Xe |
55 |
Cs |
Cesium |
132.90545 |
yes |
40 |
133Cs |
56 |
Ba |
Barium |
137.327 |
yes |
40 |
138Ba |
57 |
La |
Lathanum |
138.9055 |
yes |
39 |
139La |
58 |
Ce |
Cerium |
140.116 |
yes |
39 |
140Ce |
59 |
Pr |
Praseodymium |
140.907648 |
yes |
39 |
141Pr |
60 |
Nd |
Neodymium |
144.24 |
yes |
36 |
142Nd |
61 |
Pm |
Prometium |
145.0 |
no |
36 |
- |
62 |
Sm |
Samarium |
150.36 |
yes |
36 |
152Sm |
63 |
Eu |
Europium |
151.964 |
yes |
36 |
153Eu |
64 |
Gd |
Gadolinium |
157.25 |
yes |
34 |
158Gd |
65 |
Tb |
Terbium |
158.92534 |
yes |
34 |
159Tb |
66 |
Dy |
Dysprosium |
162.5 |
yes |
34 |
164Dy |
67 |
Ho |
Holmium |
164.93032 |
yes |
34 |
165Ho |
68 |
Er |
Erbium |
167.259 |
yes |
34 |
166Er |
69 |
Tm |
Thulium |
168.93421 |
yes |
34 |
169Tm |
70 |
Yb |
Ytterbium |
173.04 |
yes |
34 |
174Yb |
71 |
Lu |
Lutetium |
174.967 |
yes |
35 |
175Lu |
72 |
Hf |
Hafnium |
178.49 |
yes |
33 |
180Hf |
73 |
Ta |
Tantalum |
180.9479 |
yes |
33 |
181Ta |
74 |
W |
Tungsten |
178.49 |
yes |
33 |
184W |
75 |
Re |
Rhenium |
186.207 |
yes |
33 |
187Re |
76 |
Os |
Osmium |
190.23 |
yes |
35 |
192Os |
77 |
Ir |
Iridium |
192.217 |
yes |
35 |
193Ir |
78 |
Pt |
Platinum |
195.078 |
yes |
35 |
195Pt |
79 |
Au |
Gold |
196.966552 |
yes |
35 |
197Au |
80 |
Hg |
Mercury |
200.59 |
yes |
34 |
202Hg |
81 |
Tl |
Thallium |
204.3833 |
yes |
34 |
205Tl |
82 |
Pb |
Lead |
207.2 |
yes |
34 |
208Pb |
83 |
Bi |
Bismuth |
208.98038 |
yes |
32 |
209Bi |
84 |
Po |
Polonium |
209.0 |
no |
29 |
- |
85 |
At |
Astatine |
210.0 |
no |
31 |
- |
86 |
Rn |
Radon |
222.0 |
no |
33 |
- |
87 |
Fr |
Francium |
223.0 |
no |
33 |
- |
88 |
Ra |
Radium |
226.0 |
no |
32 |
- |
89 |
Ac |
Actinium |
227.0 |
no |
30 |
227Ac |
90 |
Th |
Thorium |
232.0381 |
no |
29 |
227Th |
91 |
Pa |
Protactinium |
231.03588 |
no |
28 |
- |
92 |
U |
Uranium |
238.02891 |
no |
25 |
238U |
93 |
Np |
Neptunium |
237.0 |
no |
20 |
- |
94 |
Pu |
Plutonium |
237.0 |
no |
20 |
- |
95 |
Am |
Americium |
243.0 |
no |
19 |
- |
96 |
Cm |
Curium |
247.0 |
no |
20 |
- |
97 |
Bk |
Berkelium |
247.0 |
no |
20 |
- |
98 |
Cf |
Californium |
251.0 |
no |
20 |
- |
99 |
Es |
Einsteinium |
252.0 |
no |
18 |
- |
100 |
Fm |
Fermium |
257.0 |
no |
18 |
- |
101 |
Md |
Mendelevium |
258.0 |
no |
16 |
- |
102 |
No |
Nobelium |
259.0 |
no |
14 |
- |
103 |
Lr |
Lawrencium |
262.0 |
no |
13 |
- |
104 |
Rf |
Rutherfordium |
261.0 |
no |
12 |
- |
105 |
Db |
Dubnium |
262.0 |
no |
11 |
- |
106 |
Sg |
Seaborgium |
266.0 |
no |
9 |
- |
107 |
Bh |
Bohrium |
264.0 |
no |
8 |
- |
108 |
Hs |
Hassium |
277.0 |
no |
8 |
- |
109 |
Mt |
Meitnerium |
268.0 |
no |
7 |
- |
110 |
Ds |
Darmstadtium |
281.0 |
no |
8 |
- |