Isotope Notation Practice Answer Key (CHEM 1405)

isotope

symbol

p+

n^o

e^-

Atomic #

Mass #

1

copper - 66

⁶⁶₂₉Cu

29

37

29

29

66

2

nickel - 65

⁶⁵₂₈Ni

28

37

28

28

65

3

potassium - 46

⁴⁶₁₉K

19

27

19

19

46

4

fermium - 255

²⁵⁵₁₀₀Fm

100

155

100

100

255

5

aluminum – 29

²⁹₁₃Al

13

16

13

13

29

6

strontium - 66

⁶⁶₃₈Sr

38

28

38

38

66

7

krypton - 80

⁸⁰₃₆Kr

36

44

36

36

80

8

selenium - 80

⁸⁰₃₄Se

34

46

34

34

80

9

rubidium - 102

¹⁰²₃₇Rb

37

65

37

37

65

10

gold - 209

²⁰⁹₇₉Au

79

120

79

79

209

11

tellurium - 122

¹²²₅₂Te

52

70

52

52

122

12

gadolinium - 148

¹⁴⁸₆₄Gd

64

84

64

64

148

13

praseodymium - 140

¹⁴⁰₅₉Pr

59

81

59

59

140

14

samarium - 151

¹⁵¹₆₂Sm

62

89

62

62

151

15

curium - 243

²⁴³₉₆Cm

96

147

96

96

243

16

bromine - 81

⁸¹₃₅Br

35

46

35

35

81

17

chlorine - 36

³⁶₁₇Cl

17

19

17

17

36

18

uranium - 235

²³⁵₉₂U

92

143

92

92

235

19

chromium - 54

⁵⁴₂₄Cr

24

30

24

24

54

20

manganese - 53

⁵³₂₅Mn

25

28

25

25

53