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Skyscrapers, Neon Lights, and the Periodic Table - page 5 / 30

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PERIODIC TABLE OF THE ELEMENTS

Columns of elements are called groups. Elements in the same group have similar chemical properties.

1

1

Hydrogen 1 H 1.008

2

2

Lithium 3 Li 6.941

Beryllium 4 Be 9.012

3

Sodium 11 Na 22.990

Magnesium 12 Mg 24.305

3

4

5

Element

Hydrogen

Atomic number

1

Symbol

H

Atomic mass

1.008

6

State of matter

Gas Liquid Solid Synthetic

The first three symbols tell you the state of matter of the element at room temperature. The fourth symbol identifies elements that are not present in significant amounts on Earth. Useful amounts are made synthetically.

7

8

9

Potassium

Calcium

Scandium

Titanium

Vanadium

Chromium

Manganese

Iron

Cobalt

19

20

21

22

23

24

25

26

27

K

Ca

Sc

Ti

V

Cr

Mn

Fe

Co

39.098

40.078

44.956

47.867

50.942

51.996

54.938

55.845

58.933

4

Cesium

Barium

Lanthanum

Hafnium

55

56

57

72

Cs

Ba

La

Hf

132.905

137.327

138.906

178.49

Rubidium

Strontium

Yttrium

Zirconium

37

38

39

40

Rb

Sr

Y

Zr

85.468

87.62

88.906

91.224

5

6

Francium

Radium

Actinium

Rutherfordium

87

88

89

104

Fr

Ra

Ac

Rf

(223)

(226)

(227)

(261)

7

Rows of elements are called periods. Atomic number increases across a period.

The number

The arrow shows where these elements would fit into the periodic table. They are moved to the bottom of the table to save space.

Lanthanide series

Actinide series

Dubnium

Seaborgium

Bohrium

Hassium

Meitnerium

105

106

107

108

109

Db

Sg

Bh

Hs

Mt

(262)

(266)

(264)

(277)

(268)

Niobium

Molybdenum

Technetium

Ruthenium

Rhodium

41

42

43

44

45

Nb

Mo

Tc

Ru

Rh

92.906

95.94

(98)

101.07

102.906

Cerium

Praseodymium

Neodymium

Promethium

Samarium

58

59

60

61

62

Ce

Pr

Nd

Pm

Sm

140.116

140.908

144.24

(145)

150.36

in parentheses

is the mass number of the longest-lived isotope for that element.

Tantalum

Tungsten

Rhenium

Osmium

Iridium

73

74

75

76

77

Ta

W

Re

Os

Ir

180.948

183.84

186.207

190.23

192.217

Thorium

Protactinium

Uranium

Neptunium

Plutonium

90

91

92

93

94

Th

Pa

U

Np

Pu

232.038

231.036

238.029

(237)

(244)

100

  • K CHAPTER 4 The Periodic Table

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