Quatre nouveaux éléments chimiques découverts | Les Echos
Les scientifiques ont découvert et nommé quatre nouveaux éléments : le 113, 115, 117 et 118. Eurêka ! Des scientifiques japonais, russes et amé ...
élément chimique.
Bien avant de pouvoir leur donner un nom, les équipes de chercheurs ont dû établir et prouver qu’il s’agissait bien d’un nouvel <anchor>élément chimique.</anchor> Pour cela, ils ont dû assurer qu’il correspondait à la charte émise, en 1991, par l’IUPAC. Celle-ci détermine les conditions qu’il faut remplir pour que le nouvel élément soit considéré comme une découverte.
The periodic table of the elements by WebElements
The periodic table of the elements by WebElements

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# The periodic table of the elements

The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.

## Links to **all data types** of the chemical elements through this periodic table

Group123456789101112131415161718Period

1

1

[H](hydrogen/contents.html "Hydrogen")

1.008

Hydrogen

2

[He](helium/contents.html "Helium")

4.0026

Helium

2

3

[Li](lithium/contents.html "Lithium")

6.94

Lithium

4

[Be](beryllium/contents.html "Beryllium")

9.0122

Beryllium

5

[B](boron/contents.html "|title_5")

10.81

Boron

6

[C](carbon/contents.html "|title_6")

12.011

Carbon

7

[N](nitrogen/contents.html "Nitrogen")

14.007

Nitrogen

8

[O](oxygen/contents.html "Oxygen")

15.999

Oxygen

9

[F](fluorine/contents.html "Fluorine")

18.998

Fluorine

10

[Ne](neon/contents.html "Neon")

20.180

Neon

3

11

[Na](sodium/contents.html "Sodium")

22.990

Sodium

12

[Mg](magnesium/contents.html "Magnesium")

24.305

Magnesium

13

[Al](aluminium/contents.html "Aluminium")

26.982

Aluminium

14

[Si](silicon/contents.html "Silicon")

28.085

Silicon

15

[P](phosphorus/contents.html "Phosphorus")

30.974

Phosphorus

16

[S](sulfur/contents.html "Sulfur")

32.06

Sulfur

17

[Cl](chlorine/contents.html "Chlorine")

35.45

Chlorine

18

[Ar](argon/contents.html "Argon")

39.948

Argon

4

19

[K](potassium/contents.html "Potassium")

39.098

Potassium

20

[Ca](calcium/contents.html "Calcium")

40.078

Calcium

21

[Sc](scandium/contents.html "Scandium")

44.956

Scandium

22

[Ti](titanium/contents.html "Titanium")

47.867

Titanium

23

[V](vanadium/contents.html "Vanadium")

50.942

Vanadium

24

[Cr](chromium/contents.html "Chromium")

51.996

Chromium

25

[Mn](manganese/contents.html "Manganese")

54.938

Manganese

26

[Fe](iron/contents.html "Iron")

55.845

Iron

27

[Co](cobalt/contents.html "Cobalt")

58.933

Cobalt

28

[Ni](nickel/contents.html "Nickel")

58.693

Nickel

29

[Cu](copper/contents.html "Copper")

63.546

Copper

30

[Zn](zinc/contents.html "Zinc")

65.38

Zinc

31

[Ga](gallium/contents.html "Gallium")

69.723

Gallium

32

[Ge](germanium/contents.html "Germanium")

72.630

Germanium

33

[As](arsenic/contents.html "Arsenic")

74.922

Arsenic

34

[Se](selenium/contents.html "Selenium")

78.971

Selenium

35

[Br](bromine/contents.html "Bromine")

79.904

Bromine

36

[Kr](krypton/contents.html "Krypton")

83.798

Krypton

5

37

[Rb](rubidium/contents.html "Rubidium")

85.468

Rubidium

38

[Sr](strontium/contents.html "Strontium")

87.62

Strontium

39

[Y](yttrium/contents.html "Yttrium")

88.906

Yttrium

40

[Zr](zirconium/contents.html "Zirconium")

91.224

Zirconium

41

[Nb](niobium/contents.html "Niobium")

92.906

Niobium

42

[Mo](molybdenum/contents.html "Molybdenum")

95.95

Molybdenum

43

[Tc](technetium/contents.html "Technetium") ☢

98

Technetium

44

[Ru](ruthenium/contents.html "Ruthenium")

101.07

Ruthenium

45

[Rh](rhodium/contents.html "Rhodium")

102.91

Rhodium

46

[Pd](palladium/contents.html "Palladium")

106.42

Palladium

47

[Ag](silver/contents.html "Silver")

107.87

Silver

48

[Cd](cadmium/contents.html "Cadmium")

112.41

Cadmium

49

[In](indium/contents.html "Indium")

114.82

Indium

50

[Sn](tin/contents.html "Tin")

118.71

Tin

51

[Sb](antimony/contents.html "Antimony")

121.76

Antimony

52

[Te](tellurium/contents.html "Tellurium")

127.60

Tellurium

53

[I](iodine/contents.html "Iodine")

126.90

Iodine

54

[Xe](xenon/contents.html "Xenon")

131.29

Xenon

6

55

[Cs](caesium/contents.html "Caesium")

132.91

Caesium

56

[Ba](barium/contents.html "Barium")

137.33

Barium

\*

71

[Lu](lutetium/contents.html "Lutetium")

174.97

Lutetium

72

[Hf](hafnium/contents.html "Hafnium")

178.49

Hafnium

73

[Ta](tantalum/contents.html "Tantalum")

180.95

Tantalum

74

[W](tungsten/contents.html "Tungsten")

183.84

Tungsten

75

[Re](rhenium/contents.html "Rhenium")

186.21

Rhenium

76

[Os](osmium/contents.html "Osmium")

190.23

Osmium

77

[Ir](iridium/contents.html "Iridium")

192.22

Iridium

78

[Pt](platinum/contents.html "Platinum")

195.08

Platinum

79

[Au](gold/contents.html "Gold")

196.97

Gold

80

[Hg](mercury/contents.html "Mercury")

200.59

Mercury

81

[Tl](thallium/contents.html "Thallium")

204.38

Thallium

82

[Pb](lead/contents.html "Lead")

207.2

Lead

83

[Bi](bismuth/contents.html "Bismuth")

208.98

Bismuth

84

[Po](polonium/contents.html "Polonium") ☢

209

Polonium

85

[At](astatine/contents.html "Astatine") ☢

210

Astatine

86

[Rn](radon/contents.html "Radon") ☢

222

Radon

7

87

[Fr](francium/contents.html "Francium") ☢

223

Francium

88

[Ra](radium/contents.html "Radium") ☢

226

Radium

\*\*

103

[Lr](lawrencium/contents.html "Lawrencium") ☢

262

Lawrencium

104

[Rf](rutherfordium/contents.html "Rutherfordium") ☢

267

Rutherfordium

105

[Db](dubnium/contents.html "Dubnium") ☢

270

Dubnium

106

[Sg](seaborgium/contents.html "Seaborgium") ☢

269

Seaborgium

107

[Bh](bohrium/contents.html "Bohrium") ☢

270

Bohrium

108

[Hs](hassium/contents.html "Hassium") ☢

269

Hassium

109

[Mt](meitnerium/contents.html "Meitnerium") ☢

278

Meitnerium

110

[Ds](darmstadtium/contents.html "Darmstadtium") ☢

281

Darmstadtium

111

[Rg](roentgenium/contents.html "Roentgenium") ☢

281

Roentgenium

112

[Cn](copernicium/contents.html "Copernicium") ☢

285

Copernicium

113

[Nh](nihonium/contents.html "Nihonium") ☢

286

Nihonium

114

[Fl](flerovium/contents.html "Flerovium") ☢

289

Flerovium

115

[Mc](moscovium/contents.html "Moscovium") ☢

289

Moscovium

116

[Lv](livermorium/contents.html "Livermorium") ☢

293

Livermorium

117

[Ts](tennessine/contents.html "Tennessine") ☢

293

Tennessine

118

[Og](oganesson/contents.html "Oganesson") ☢

294

Oganesson

\*Lanthanoids\*

57

[La](lanthanum/contents.html "Lanthanum")

138.91

Lanthanum

58

[Ce](cerium/contents.html "Cerium")

140.12

Cerium

59

[Pr](praseodymium/contents.html "Praseodymium")

140.91

Praseodymium

60

[Nd](neodymium/contents.html "Neodymium")

144.24

Neodymium

61

[Pm](promethium/contents.html "Promethium") ☢

145

Promethium

62

[Sm](samarium/contents.html "Samarium")

150.36

Samarium

63

[Eu](europium/contents.html "Europium")

151.96

Europium

64

[Gd](gadolinium/contents.html "Gadolinium")

157.25

Gadolinium

65

[Tb](terbium/contents.html "Terbium")

158.93

Terbium

66

[Dy](dysprosium/contents.html "Dysprosium")

162.50

Dysprosium

67

[Ho](holmium/contents.html "Holmium")

164.93

Holmium

68

[Er](erbium/contents.html "Erbium")

167.26

Erbium

69

[Tm](thulium/contents.html "Thulium")

168.93

Thulium

70

[Yb](ytterbium/contents.html "Ytterbium")

173.05

Ytterbium

\*\*Actinoids\*\*

89

[Ac](actinium/contents.html "Actinium") ☢

227

Actinium

90

[Th](thorium/contents.html "Thorium") ☢

232.04

Thorium

91

[Pa](protactinium/contents.html "Protactinium") ☢

231.04

Protactinium

92

[U](uranium/contents.html "Uranium") ☢

238.03

Uranium

93

[Np](neptunium/contents.html "Neptunium") ☢

237

Neptunium

94

[Pu](plutonium/contents.html "Plutonium") ☢

244

Plutonium

95

[Am](americium/contents.html "Americium") ☢

243

Americium

96

[Cm](curium/contents.html "Curium") ☢

247

Curium

97

[Bk](berkelium/contents.html "Berkelium") ☢

247

Berkelium

98

[Cf](californium/contents.html "Californium") ☢

251

Californium

99

[Es](einsteinium/contents.html "Einsteinium") ☢

252

Einsteinium

100

[Fm](fermium/contents.html "Fermium") ☢

257

Fermium

101

[Md](mendelevium/contents.html "Mendelevium") ☢

258

Mendelevium

102

[No](nobelium/contents.html "Nobelium") ☢

259

Nobelium

The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically). The properties of elements in groups are similar in some respects to each other.

There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here is very useful and the most common. The periodic table is a masterpiece of organised chemical information and the evolution of chemistry's periodic table into the current form is an astonishing achievement.

The International Union of Pure and Applied Chemistry (IUPAC) confirmed the names of elements 113, 115, 117, and 118 as:

- [Nihonium](nihonium/) (symbol Nh), for element 113
- [Moscovium](moscovium/) (symbol Mc), for element 115
- [Tennessine](tennessine/) (symbol Ts), for element 117
- [Oganesson](oganesson/) (symbol Og), for element 118

This followed a 5-month period of public review after which the names earlier proposed by the discoverers were approved by IUPAC.

You can buy this **periodic table poster** and more at the [WebElements periodic table shop](https://www.webelements.com/shop/product-category/posters/).

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On 1 May 2014 a paper published in [Phys. Rev. Lett](http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.172501) by J. Khuyagbaatar and others states the superheavy element with atomic number Z = 117 (ununseptium) was produced as an evaporation residue in the 48Ca and 249Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allows measurement of decays of single atomic nuclei with very short half-lives. Two decay chains comprising seven α-decays and a spontaneous fission each were identified and assigned to the isotope 294Uus (element 117) and its decay products.

- Key properties
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- [Ionization energy (first)](https://www.webelements.com/periodicity/ionis_energy_1/)
- [Covalent radius](https://www.webelements.com/periodicity/covalent_radius/)
- [Metallic radius](https://www.webelements.com/periodicity/metallic_radius/)
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- [Other properties](https://www.webelements.com/periodicity/index/)

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