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 Sito molto ben fatto sulla Tavola periodica degli elementi

Elemento chimico 

Simbolo  

Numero atomico

Peso atomico 

Anno scoperta

Scopritore

Actinium  

Ac 

89

227.03 

1899

Debierne  

Aluminum  

Al 

13

26.9815 

1825

Oersted  

Americium 

Am

95

243*

1944

Seaborg, e al.  

Antimony

Sb

51

121.75 

1450

Valentine  

Argon

Ar  

18

39.948  

1894

Rayleigh, Ramsay  

Arsenic 

As 

33

74.9216 

XIII sec. 

Albertus Magnus  

Astatine 

At   

85

210* 

1940

Corson, e al.  

Barium  

Ba  

56

137.33 

1808

Davy  

Berkelium

Bk 

97

247*

1949

Thompson,Ghiorso,Sea borg  

Beryllium 

Be 

4

 9.0122

1798

Vauquelin  

Bismuth 

Bi

83

208.980

XV sec.

Valentine

Bohrium

Bh

107

264*

1981

Münzenberg, e al.

Boron 

B

5

10.811a

1808

Gay-Lussac

Bromine

Br 

35

79.904b

1826

Balard  

Cadmium 

Cd 

48

112.41

1817

Stromeyer  

Calcium 

Ca 

2

40.08 

 1808

Davy  

Californium 

Cf 

98

251*

1950

Thompson, e al.  

Carbon

C 

6

12.01115a

a.C

sconosciuto  

Cerium 

Ce

58

140.12 

1803

Klaproth

Cesium

Cs

55

132.905

1860

Bunsen, Kirchhoff  

Chlorine

Cl

17

35.453b

1774

Scheele  

Chromium

Cr

24

51.996b

1797

Vauquelin

Cobalt

Co

27

58.9332

1735

Brandt  

Copper (rame)

Cu 

29

63.546b

1944 a.C

sconosciuto  

Curium

Cm

96

247*

1944

Seaborg, James,Ghiorso

Dysprosium

Dy 

66

162.50*

1886

Boisbaudran  

Einsteinium

Es

99

252*

1952

Ghiorso, e al.  

Erbium

Er

68

167.26

1843

Mosander  

Europium 

Eu 

63

151.96

1901

Demarcay

Fermium

Fm

100

257*

1953

Ghiorso, e al.

Fluorine

F

9

18.9984 

1771

Scheele

Francium

Fr

87

223*

1939

Perey  

Gadolinium 

Gd

64

157.25

1886

Marignac  

Gallium

Ga 

31

69.72

1875

Boisbaudran

Germanium 

Ge

32

72.59

1886

Winkler  

Gold (oro)

Au

79

196.967

a.C

sconosciuto  

Hafnium

Hf 

72

178.49 

1923

Coster, Hevesy  

Hahnium1

Ha

105

262*

1970

Ghiorso, e al.  

Hassium

Hs

108

269*

1984

Münzenberg, e al.  

Helium 

He

2

4.0026 

1868

Janssen, Lockyer

Holmium

Ho

67

164.930

1878

Soret,Delafontaine  

Hydrogen 

H 

1

1.00797a 

1766

Cavendish  

Indium

In

49

114.82 

1863

Reich, Richter  

Iodine

I

53

126.9044

1811

Courtois  

Iridium 

Ir 

77

192.22

1804

Tennant  

Iron (ferro)

Fe

26

55.847b

a.C

sconosciuto  

Krypton 

Kr 

36

83.80

1898

Ramsay, Travers  

Lanthanum

La

57

138.91

1839

Mosander   

Lawrencium 

Lr 

103

262*

1961

Ghiorso,   T.Sikkeland,  A.E. Larsh, R.M. Latimer  

Lead (piombo)

Pb

82

207.19

a.C

sconosciuto  

Lithium

Li

3

6.939 

1817

Arfvedson  

Lutetium

Lu 

71

174.97

1907

Welsbach, Urbain  

Magnesium

Mg 

12 

24.312

1829

Bussy  

Manganese 

Mn

25

54.9380

1774

Gahn  

Meitnerium 

Mt

109

268*

1982

Münzenberg, e al.

Mendelevium 

Md

101

258*

1955

Ghiorso, e al.  

Mercury

Hg

80

200.59

a.C 

sconosciuto  

Molybdenum 

Mo

42

95.94 

1782

Hjelm  

Neodymium

Nd 

60

144.24

1885

Welsbach  

Neon

Ne

10

20.183 

1898

Ramsay,Travers  

Neptunium 

Np

93

237.05*

1940

McMillan,Abelson  

Nickel

Ni 

28

58.70 

1751

Cronstedt  

Niobium2

Nb

41

92.906

1801

Hatchett  

Nitrogen (azoto)

N

7

14.0067

1772

Rutherford  

Nobelium

No

102

259*

1958

Ghiorso, e al.  

Osmium   

Os 

76

190.2 

1804

Tennant  

Oxygen

O

8

15.9994a

1774

Priestley, Scheele  

Palladium 

Pd

46

106.4 

1803

Wollaston  

Phosphorus

P

15

30.9738 

1669

Brand  

Platinum

Pt

78

195.09

1735

Ulloa  

Plutonium

Pu

94

244*

1940

Seaborg, e al.

Polonium 

Po 

84

210**

1898

P. and M. Curie  

Potassium

K

19

39.102

1807

Davy  

Praseodymium

Pr

59

140.907

1885

Welsbach  

Promethium

Pm

61

147**

1945

Glendenin, Marinsky,Coryell  

Protactinium 

Pa

91

231.04*

1917

Hahn, Meitner  

Radium

Ra

88

226.03*

1898

P. e M. Curie, Bemont Dorn  

Radon 

Rn

86

222*

1900

Rhenium 

Re 

75

186.21 

1925

Noddack, Tacke,  Berg

Rhodium 

Rh

45

102.905

1803

Wollaston  

Rubidium 

Rb

37

85.47

1861

Bunsen, Kirchhoff  

Ruthenium

Ru

44

101.07

1845

Klaus  

Rutherfordium

Rf

104

261*

1969

Ghiorso, e al.  

Samarium

Sm

62

150.35

1879

Boisbaudran  

Scandium 

Sc

21

44.956

1879

Nilson  

Seaborgium

Sg

106

266*

1974

Ghiorso, e al.  

Selenium

Se 

34

78.96

1817

Berzelius  

Silicon 

Si

14

28.086a

1823

Berzelius  

Silver (argento)

Ag

47

107.868b

a.C

sconosciuto  

Sodium

Na

11

22.9898

1807

Davy

Strontium

Sr

38

87.62

1790

Crawford  

Sulfur (zolfo)

S

16

32.064a

a.C

sconosciuto  

Tantalum

Ta

73

180.948 

1802

Ekeberg  

Technetium 

Tc 

43

99**

1937

Perrier, Segre

Tellurium 

Te

52

127.60

1782

Von Reichenstein  

Terbium 

Tb 

65

158.9324

1843

Mosander

Thallium

Tl

81

204.37

1861

Crookes  

Thorium

Th 

90

232.038

1828

Berzelius

Thulium

Tm

69

168.934

1879

Cleve  

Tin (stagno)

Sn

50

118.69 

a.C.

sconosciuto  

Titanium  

Ti

22

47.90 

1791

Gregor  

Tungsten (Wolfram)

W

74

183.85

1783

d'Elhujar  

Uranium 

U

92

238.03 

1789

Klaproth  

Vanadium 

V

23

50.942 

1830

Sefstrom  

Xenon

Xe 

54

131.30

1898

Ramsay, Travers  

Ytterbium 

Yb

70

173.04

1878

Marignac  

Yttrium 

Y

39

88.905

Gadolin  

Zinc 

Zn 

30

65.37

sconosciuto  

Zirconium 

Zr 

40

91.22

Klaproth