Periodic table of elements

1

Hydrogen

1.0079

1

H He2

Helium

4.0026

2

Li3

Lithium

6.9410

2

1

Be4

Beryllium

9.0122

2

2

Ne10

Neon

20.1797

2

8

F9

Fluorine

18.9984

2

7

O8

Oxygen

15.9994

2

6

N7

Nitrogen

14.0070

2

5

C6

Carbon

12.0107

2

4

B5

Boron

10.8110

2

3

Na11

Sodium

22.9898

2

8

1

Mg12

Magnesium

24.3050

2

8

2

Al13

Aluminium

26.9815

2

8

3

Si14

Silicon

28.0855

2

8

4

P15

Phosphorus

30.9738

2

8

5

S16

Sulphur

32.0650

2

8

6

Cl17

Chlorine

35.4530

2

8

7

Ar18

Argon

39.9480

2

8

8

K19

Potassium

39.0980

2

8

8

1 CA20

Calcium

40.0780

2

8

8

2 Sc21

Scandium

44.9560

2

8

9

2 Ti22

Titanium

47.8670

2

8

10

2 V23

Vanadium

50.9420

2

8

11

2 Cr24

Chromium

51.9960

2

8

13

1 Mn25

Manganese

54.9380

2

8

13

2 Fe26

Iron

55.8450

2

8

14

2 Co27

Cobalt

58.9330

2

8

15

2 Ni28

Nickel

58.6930

2

8

16

2 Cu29

Copper

63.5460

2

8

18

1 Zn30

Zinc

65.3900

2

8

18

2 Ga31

Gallium

69.7230

2

8

18

3 Ge32

Germanium

72.6400

2

8

18

4 As33

Arsenic

74.9220

2

8

18

5 Se34

Selenium

78.9600

2

8

18

6 Br35

Bromine

79.9040

2

8

18

7 Kr36

Krypton

83.8000

2

8

18

8

Rb37

Rubidium

85.4680

2

8

18

8

1 Sr38

Strontium

87.6200

2

8

18

8

2 Y39

Yttrium

88.9060

2

8

18

9

2 Zr40

Zirconium

91.2240

2

8

18

10

2 Nb41

Niobium

92.9060

2

8

18

12

1 Tc43

Technetium

(98.0000)

2

8

18

14

1 Ru44

Ruthenium

101.0700

2

8

18

15

1 Rh45

Rhodium

102.9100

2

8

18

16

1 Pd46

Palladium

106.4200

2

8

18

18 Ag47

Silver

107.8700

2

8

18

18

1 Cd48

Cadmium

112.4100

2

8

18

18

2 In49

Indium

114.8200

2

8

18

18

3 Sn50

Tin

118.7100

2

8

18

18

4 Sb51

Antimony

121.7600

2

8

18

18

5 Te52

Tellurium

127.6000

2

8

18

18

6 I53

Iodine

126.9000

2

8

18

18

7 Xe54

Xenon

131.2900

2

8

18

18

8Mo42

Molybdenum

95.9400

2

8

18

13

1

Cs55

Cesium

132.9100

2

8

18

18

8

1Ba56

Barium

137.3300

2

8

18

18

8

2

Ce58

Cerium

140.1200

2

8

18

20

8

2La57

Lanthanium

138.9100

2

8

18

18

9

2Pr59

Praseodyium

140.9100

2

8

18

21

8

2Nd60

Neodymium

144.2400

2

8

18

22

8

2Pm61

Promethium

(145.0000)

2

8

18

23

8

2Sm62

Samarium

150.3600

2

8

18

24

8

2Eu63

Europium

151.9600

2

8

18

25

8

2Gd64

Gadolinium

157.2500

2

8

18

25

9

2Tb65

Terbium

158.9300

2

8

18

27

8

2Dy66

Dysprosium

162.5000

2

8

18

28

8

2Ho67

Holmium

164.9300

2

8

18

29

8

2Er68

Erbium

167.2600

2

8

18

30

8

2Tm69

Thulium

168.9300

2

8

18

31

8

2Yb70

Ytterbium

173.0400

2

8

18

32

8

2Lu71

Lutetium

174.9700

2

8

18

32

9

2

Hf72

Hafnium

178.4900

2

8

18

32

10

2Ta73

Tantalum

180.9500

2

8

18

32

11

2W74

Tungsten

183.8400

2

8

18

32

12

2Re75

Rhenium

186.2100

2

8

18

32

13

2Os76

Osmium

190.2300

2

8

18

32

14

2Ir77

Iridium

192.2200

2

8

18

32

15

2Pt78

Platinum

195.0800

2

8

18

32

17

1Au79

Gold

196.9700

2

8

18

32

18

1Hg80

Mercury

200.5900

2

8

18

32

18

2Tl81

Thallium

204.3800

2

8

18

32

18

3Pb82

Lead

207.2000

2

8

18

32

18

4Bi83

Bismuth

208.9800

2

8

18

32

18

5Po84

Polonium

(209.0000)

2

8

18

32

18

6At85

Astatine

(210.0000)

2

8

18

32

18

7Rn86

Radon

222.0000

2

8

18

32

18

8

Fr87

Francium

(223.0000)

2

8

18

32

18

8

1

Ra88

Radium

226.0300

2

8

18

32

18

8

2

Ac89

Actinium

(227.0000)

2

8

18

32

18

9

2

Th90

Thorium

232.0381

2

8

18

32

18

10

2

Pa91

Protactinium

231.0359

2

8

18

32

20

9

2

U92

Uranium

238.0300

2

8

18

32

20

9

2

Np93

Neptunium

237.0500

2

8

18

32

23

8

2

Pu94

Plutonium

(244.0000)

2

8

18

32

24

8

2

Am95

Americium

(243.0000)

2

8

18

32

25

8

2

Cm96

Curium

(247.0000)

2

8

18

32

25

9

2

Bk97

Berkelium

(247.0000)

2

8

18

32

27

8

2

Cf98

Californium

(251.0000)

2

8

18

32

28

8

2

Es99

Einsteinium

(252.0000)

2

8

18

32

29

8

2

Fm100

Fermium

(257.0000)

2

8

18

32

30

8

2

Md101

Mendelevium

(258.0000)

2

8

18

32

31

8

2

No102

Nobelium

(259.0000)

0

18

32

32

8

2Lr103

Lawrencium

(262.0000)

2

8

18

32

32

9

2

Rf104

Rutherfordium

261.1100

2

8

18

32

32

10

2

Db105

Dubnium

262.1100

2

8

18

32

32

11

2

Sg106

Seaborgium

226.0300

2

8

18

32

32

12

2

E57 - E71

E89 - E103

Rows in the table represent the periods and get longer as the atomic

numbers increase. The number of electrons increase from left to right

across the table. There are eighteen groups represented by columns

in the table; these groups have chemical features in common and

have the same number of electrons in the outer orbit of the atoms.

Most of the elements are metals with the non-metals occurring more

frequently in groups thirteen to eighteen. Groups one to twelve are

exclusively metals and on the boundary between the two are

metalloids which display properties of both metals and non-metals.

Some of the groups have collective names: group one are the alkali

metals; group two are the alkaline earth metals; group eleven are the

coinage metals; group seventeen are the halogens; and group

eighteen are the noble gases. The first widely recognised table was

published in 1869 by the Russian chemist Dmitri Mendeleev.

Br35

Bromine

79.9040

2

8

18

7

Atomic number(number of protons in an atom)

Chemical formula

Atomic weight (of most stable isotope when in brackets)

Number of electrons orbiting in each shell

Bh107

Bohrium

262.1200

2

8

18

32

32

13

2

Hs108

Hassium

264.1300

2

8

18

32

32

14

2

Mt109

Meitnerium

266.1400

2

8

18

32

32

15

2

Ds110

Darmstadium

(281.0000)

2

8

18

32

32

16

2

Rg111

Roentgenium

(280.0000)

2

8

18

32

32

17

2

112

Copernicium

(285.0000)

2

8

18

32

32

18

2

Cn Uut113

Ununtrium

(284.0000)

2

8

18

32

32

18

3

114

Flerovium

(289.0000)

2

8

18

32

32

18

4

Uup115

Ununpentium

(288.0000)

2

8

18

32

32

18

5

116

Livermorium

(293.0000)

2

8

18

32

32

18

6

Uus117

Ununseptium

(294.0000)

2

8

18

32

32

18

7

Uuo118

Ununoctium

(294.0000)

2

8

18

32

32

18

8

1

2

3 4 5 6 7 8 9 10 11 12

13 14 15 16 17

18

1

2

3

4

5

6

7

Alkali metals

Alkaline earth metals

Transition metals

Other metals

Other non-metals

Halogens

Inert gases

Lanthanides

Actinides

Trans-actinides

(Manmade atoms

that exist for less

than a second)

Radioactive element

Liquid element

Gas element

Fl Lv