Solution p 11 and 12

 

1.         Complete the following table:

 

Name

 

 

 

Isotope

Notation

Atomic Number

Mass Number

Number of Protons

Number of Neutrons

Number of Electrons

carbon

 

14C

 

6

14

6

8

6

oxygen

 

15O

 

8

15

8

7

8

Phosphorus

 

31P

 

15

31

15

16

15

Boron

9B

 

5

 

 

9

5

 

 

4

5

 

 

Selenium

79Se

34

 

 

79

34

 

 

45

34

 

 

Californium

251Cf

98

251

98

153

98

Fluorine

19F

9

19

9

10

9

Potassium

K

19

49

19

30

19

Magnesium

Mg

12

25

12

13

12

Krypton

Kr

36

77

36

41

36

Hydrogen

H

1

3

1

2

1

Hydrogen

H

1

2

1

1

1

Iodine

I

53

127

53

74

53

Tantalum

Ta

73

152

73

79

73

Argon

Ar

18

84

18

66

18

Mercury

Hg

80

200

80

120

80

Vanadium

V

23

51

23

28

23

Titanium

Ti

22

48

22

26

22

Boron

B

5

11

5

6

5

Oxygen

O

8

15

8

7

8

Fluorine

F

9

19

9

10

9

Sodium

Na

11

23

11

12

11

 

2.         Give two examples of isotope pairs.

 

3H and 1H

12 C and 14C

 

3.         Discuss the similarities and differences between 12C and 14C.

 

similarities:     similar chemical properties; both burn for example to give carbon dioxide

 

differences:     different masses( physical properties differ); different nuclear properties only 14C is radioactive