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

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

1.008

Hydrogen

2

4.0026

Helium

2

3

6.94

Lithium

4

9.0122

Beryllium

5

10.81

Boron

6

12.011

Carbon

7

14.007

Nitrogen

8

15.999

Oxygen

9

18.998

Fluorine

10

20.180

Neon

3

11

22.990

Sodium

12

24.305

Magnesium

13

26.982

Aluminium

14

28.085

Silicon

15

30.974

Phosphorus

16

32.06

Sulfur

17

35.45

Chlorine

18

39.948

Argon

4

19

39.098

Potassium

20

40.078

Calcium

21

44.956

Scandium

22

47.867

Titanium

23

50.942

Vanadium

24

51.996

Chromium

25

54.938

Manganese

26

55.845

Iron

27

58.933

Cobalt

28

58.693

Nickel

29

63.546

Copper

30

65.38

Zinc

31

69.723

Gallium

32

72.630

Germanium

33

74.922

Arsenic

34

78.971

Selenium

35

79.904

Bromine

36

83.798

Krypton

5

37

85.468

Rubidium

38

87.62

Strontium

39

88.906

Yttrium

40

91.224

Zirconium

41

92.906

Niobium

42

95.95

Molybdenum

43

98

Technetium

44

101.07

Ruthenium

45

102.91

Rhodium

46

106.42

Palladium

47

107.87

Silver

48

112.41

Cadmium

49

114.82

Indium

50

118.71

Tin

51

121.76

Antimony

52

127.60

Tellurium

53

126.90

Iodine

54

131.29

Xenon

6

55

132.91

Caesium

56

137.33

Barium

*

71

174.97

Lutetium

72

178.49

Hafnium

73

180.95

Tantalum

74

183.84

Tungsten

75

186.21

Rhenium

76

190.23

Osmium

77

192.22

Iridium

78

195.08

Platinum

79

196.97

Gold

80

200.59

Mercury

81

204.38

Thallium

82

207.2

Lead

83

208.98

Bismuth

84

209

Polonium

85

210

Astatine

86

222

Radon

7

87

223

Francium

88

226

Radium

**

103

262

Lawrencium

104

267

Rutherfordium

105

270

Dubnium

106

269

Seaborgium

107

270

Bohrium

108

269

Hassium

109

278

Meitnerium

110

281

Darmstadtium

111

281

Roentgenium

112

285

Copernicium

113

286

Nihonium

114

289

Flerovium

115

289

Moscovium

116

293

Livermorium

117

293

Tennessine

118

294

Oganesson

*Lanthanoids*

57

138.91

Lanthanum

58

140.12

Cerium

59

140.91

Praseodymium

60

144.24

Neodymium

61

145

Promethium

62

150.36

Samarium

63

151.96

Europium

64

157.25

Gadolinium

65

158.93

Terbium

66

162.50

Dysprosium

67

164.93

Holmium

68

167.26

Erbium

69

168.93

Thulium

70

173.05

Ytterbium

**Actinoids**

89

227

Actinium

90

232.04

Thorium

91

231.04

Protactinium

92

238.03

Uranium

93

237

Neptunium

94

244

Plutonium

95

243

Americium

96

247

Curium

97

247

Berkelium

98

251

Californium

99

252

Einsteinium

100

257

Fermium

101

258

Mendelevium

102

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 (symbol Nh), for element 113
- Moscovium (symbol Mc), for element 115
- Tennessine (symbol Ts), for element 117
- 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.

On 1 May 2014 a paper published in Phys. Rev. Lett 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.

You can reference the WebElements periodic table as follows:

"WebElements, https://www.webelements.com (last accessed 14th September 2024)"