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Periodic Table of the Elements

 

 

 

 

    Alkali Metals

    Alkaline Earth Metals

    Transition Metals

    Other Metals

    Nonmetals

    Noble Gases

    Lanthanoids

    Actinoids

 

 

    

 

 

 

 

C

 

Br

 

He

 

Tc

 

 

 

hydrogen

1

H

1.00794

 

 

solid

liquid

gas

synthetic

helium

2

He

4.002602

lithium

3

Li

6.941

beryllium

4

Be

9.012182

 

key

element name

atomic number

symbol

atomic weight

 

boron

5

B

10.811

carbon

6

C

12.0107

nitrogen

7

N

14.00674

oxygen

8

O

15.9994

fluorine

9

F

18.9984

neon

10

Ne

20.1797

sodium

11

Na

22.98977

magnesium

12

Mg

24.3050

 

 

 

 

 

 

 

 

 

 

aluminium

13

Al

26.981538

silicon

14

Si

28.0855

phosphorus

15

P

30.97376

sulphur

16

S

32.065

chlorine

17

Cl

35.453

argon

18

Ar

39.984

potassium

19

K

39.0983

calcium

20

Ca

40.078

scandium

21

Sc

44.95591

titanium

22

Ti

47.867

vanadium

23

V

50.9415

chromium

24

Cr

51.9961

manganese

25

Mn

54.93805

iron

26

Fe

55.845

cobalt

27

Co

58.9332

nickel

28

Ni

58.6934

copper

29

Cu

63.546

zinc

30

Zn

65.409

gallium

31

Ga

69.723

germanium

32

Ge

72.64

arsenic

33

As

74.9216

selenium

34

Se

78.96

bromine

35

Br

79.904

krypton

36

Kr

83.798

rubidium

37

Rb

85.4678

strontium

38

Sr

87.62

yttrium

39

Y

88.90585

zirconium

40

Zr

91.225

niobium

41

Nb

92.90638

molybdenum

42

Mo

95.94

technetium

43

Tc

[98]

ruthenium

44

Ru

101.07

rhodium

45

Rh

102.9055

palladium

46

Pd

106.42

silver

47

Ag

107.8682

cadmium

48

Cd

112.411

indium

49

In

114.818

tin

50

Sn

118.710

antimony

51

Sb

121.760

tellurium

52

Te

127.60

iodine

53

I

126.9045

xenon

54

Xe

131.293

caesium

55

Cs

132.90545

barium

56

Ba

137.327

lutetium

71

Lu

174.967

hafnium

72

Hf

1.00794

tantalum

73

Ta

180.9479

tungsten

74

W

183.84

rhenium

75

Re

186.207

osmium

76

Os

190.23

iridium

77

Ir

192.217

platinum

78

Pt

195.078

gold

79

Au

196.96655

mercury

80

Hg

200.59

thallium

81

Tl

204.3833

lead

82

Pb

207.2

bismuth

83

Bi

208.980

polonium

84

Po

[209]

astatine

85

At

[210]

radon

86

Rn

[222]

francium

87

Fr

[223]

radium

88

Ra

[226]

lawrencium

103

Lr

[262]

rutherfordium

104

Rf

[261]

dubnium

105

Db

[262]

seaborgium

106

Sg

[266]

bohrium

107

Bh

[264]

hassium

108

Hs

[269]

meitnerium

109

Mt

[268]

darmstadtium

110

Ds

[271]

roentgenium

111

Rg

[272]

ununbium

112

Uub

[285]

 

ununquadium

114

Uuq

[289]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lanthanum

57

La

138.9055

cerium

58

Ce

140.116

praseodymium

59

Pr

140.90765

neodymium

60

Nd

144.24

promethium

61

Pm

[145]

samarium

62

Sm

150.36

europium

63

Eu

151.964

gadolinium

64

Gd

157.25

terbium

65

Tb

158.9253

dysprosium

66

Dy

162.50

holmium

67

Ho

164.930

erbium

68

Er

167.259

thulium

69

Tm

168.934

ytterbium

70

Yb

173.04

 

 

 

 

actinium

89

Ac

[227]

thorium

90

Th

232.038

protactinium

91

Pa

231.0359

uranium

92

U

238.0289

neptunium

93

Np

[237]

plutonium

94

Pu

[244]

americium

95

Am

[243]

curium

96

Cm

[247]

berkelium

97

Bk

[247]

californium

98

Cf

[251]

einsteinium

99

Es

[252]

fermium

100

Fm

[257]

mendelevium

101

Md

[258]

nobelium

102

No

[259]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes: Elements with atomic weights in square brackets have no stable isotopes. Different sources list different atomic weights for elements. The difference arises from the differing atomic weights of various isotopes. We have tried to list the most stable isotope. For example, some sources list the atomic weight of seaborgium as 263 and others 266. The most stable isotope appears have an atomic weight of 266 so we list that weight here. Roentgenium is still the unofficial name of element 111 but it is the one recommended by the IUPAC so we list it here instead of the generic ‘unununium’. Aluminum, cesium, and sulfur are the American spellings for aluminium, caesium, and sulphur.  Announcements of discoveries of elements 116 and 118 were made and later retracted. This table was downloaded from http://www.science-teachers.com/printable_periodic_tables.htm