List of elements
Names and signs
atomic number
atomic mass
Explorer
Year
Hydrogen (H)
1
1.0079
H. Cavendish
1766
Helium (He)
2
4.0026
P. Janssen and N. Lockyer
1868
Lithium (Li)
3
6.941
J.A. Arfvedson
1817
Beryllium (Be)
4
9.0122
Ln Vauquelin
1798
Boron (B)
5
10.811
J. L. Lujek, L. J. Thenard, H. Dewey
1808
Carbon (C)
6
12.0107
Unknown
3750 BC
Nitrogen (N)
7
14.0067
D. Rutherford
1772
Oxygen (O)
8
15.994
Shelley and Priestley
1772
Fluorine (F)
9
18.9984
H. Moissan
1886
Neon (Ne)
10
20.1797
W. Ramsay and M. Travers
1898
Sodium (Na)
11
22.9897
H. Dewey
1807
Magnesium (Mg)
12
24.305
J. Black
1755
Aluminum (Al)
13
26.9815
Hc orsted
1825
Silicon (Si)
14
28.0855
J. Bergelium
1823
Phosphorus (p)
15
30.9738
H. Brand
1669
Sulfur (S)
16
32.065
Unknown
-
Chlorine (Cl)
17
35.453
K. Sheila
1774
Organ (Ar)
18
39.948
W. Ramsay and J. Rayleigh
1894
Potassium (k)
19
39.0983
H. Dewey
1807
Calcium (Ca)
20
40.078
H. Dewey
1808
Scandium (Sc)
21
44.9559
LF Nielsen
1879
Titanium (Ti)
22
47.867
W. Gregor
1791
Vanadium (V)
23
50.9415
Amdario
1801
Chromium (Cr)
24
51.9961
Ln Vauquelin
1797
Manganese (Mn)
25
54.938
Jg Gun and I.G. Cam
1774
Iron (Fe)
26
55.845
Unknown
-
Cobalt (Co)
27
58.9332
G. Brandt
1735
Nickel (Ni)
28
58.6934
a. Croissant
1751
Copper (Cu)
29
63.546
Unknown
-
Zinc (Zn)
30
65.39
Unknown
-
Gallium (Ga)
31
69.723
D. Beasbaudrain
1875
Germanium (Ge)
32
72.64
C. Winkler
1886
Arsenic (As)
33
74.9216
a. Magnes
2500 BC
Selenium (Se)
34
78.96
J. Bergelium
1817
Bromine (Br)
35
79.904
AJ Ballard and CJ Lovig
1826
Krypton (Kr)
36
83.8
W. Ramsay and M. Travers
1898
Rubidium (Rb)
37
85.4678
R. Bunsen and G. Kirchhoff
1861
Strontium (Sr)
38
87.62
W crookshank
1790
Viterium (Y)
39
88.9059
J. Gabolin
1794
Zirconium (Zr)
40
91.224
M.H. Klaporth
1789
Niobium (Nb)
41
92.9064
C. Hatchet
1801
Molybdenum (Mo)
42
95.94
K. Shelle
1778
Technium (Tc)
43
98
a. J. Segar and C. Perrier
1937
Ruthenium (Ru)
44
101.07
K. Klaus
1844
Rhodium (Rh)
45
102.9055
W wolstein
1803
Palladium (Pd)
46
106.42
W. Volestein
1803
Silver (Ag)
47
107.8682
Unknown
-
Cadmium (Cd)
48
112.411
F. Strommeyer and KS Herman
1817
Indian (In)
49
114.818
F. Reich and T. Richter
1863
Tin (Sn)
50
118.71
Unknown
-
Antimony (Sb)
51
121.76
Unknown
3000 BC
Tellurium (Te)
52
127.6
M. von Reichenstein
1782
Iodine (I)
53
126.9045
B. Curtius
1811
Xenon (Xe)
54
131.293
W. Ramsay and M. Travers
1898
Cesium (Cs)
55
132.9055
R. Bunsen, G. Kirchhoff
1860
Barium (Ba)
56
137.327
Shelley and Dewey
1808
Lanthanum (La)
57
138.9055
C. Mosander
1839
Cerium (Ce)
58
140.116
J. Bergelius and W. Hislinger
1803
Praseodymium (Pr)
59
140.9077
C. von Welsbach
1885
Neodymium (Nd)
60
144.24
C. von Welsbach
1885
Prometheum (Pm)
61
145
J. Marinski
1945
Samarium (Sm)
62
150.36
El de Beasbaudren
1879
European (Eu)
63
151.964
H. Dimack
1901
Gadolinium (Gd)
64
157.25
D. Marignac
1880
Terbium (Tb)
65
158.9253
C. Mossender
1843
Disprosium (Dy)
66
162.5
LD Beasboudrain
1886
Holmium (Ho)
67
164.9303
J. Soret and M. Delafontei
1878
Erbium (Er)
68
167.259
C. Mossender
1839
Thulium (Tm)
69
168.9342
P. Cleave
1879
Ytterbium (Yb)
70
173.04
C. Marignac
1878
Lutisium (Lu)
71
174.967
G. Urban
1907
Hafnium (HF)
72
178.49
D. Coster and D.C. Hewsey
1923
Tantalum (Ta)
73
180.9479
a. Ikeberg
1802
Tungsten (W)
74
183.84
John Josh and Fosto Allure
1783
Rhenium (Re)
75
186.207
W. Noddak and others
1925
Osmium (Os)
76
190.23
s. Tencent
1803
Iridium (Ir)
77
192.217
s. Tencent
1803
Platinum (pt)
78
195.078
A.D. Ulloa
1735
Gold (Au)
79
196.9665
Unknown
-
Mercury (Hg)
80
200.59
Unknown
-
Thallium (Ti)
81
204.3833
W. The crux
1861
Lead (Pb)
82
207.2
Unknown
-
Bismuth (Bi)
83
208.9804
G. Agricola
1953
Polonium (Po)
84
209
Pierre and Madame Curie
1898
Estatine (At)
85
210
DR Mackenzie and KR Mckenzie
1940
Radon (Rn)
86
222
Frederick Ernest
1900
Francium (Fr)
87
223
M. Pere
1939
Radium (Ra)
88
226
Pierre and Madame Curie
1898
Actinium (Ac)
89
227
a. Devirne
1899
Thorium (Th)
90
232.0381
J. Bergelium
1828
Protectinium (Pa)
91
231.0359
F. Saudi and others
1917
Uranium (U)
92
238.0289
Martin kleproth
1789
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