Isotopes of rubidium
List of isotopes
Table:
nuclide
symbol

Z(p)

N(n)

isotopic mass (u)

half-life[n 1]

decay
mode(s)[4][n 2]

daughter
isotope(s)[n 3]

nuclear
spin and
parity

representative
isotopic
composition
(mole fraction)

range of natural
variation
(mole fraction)

excitation energy

71Rb

37

34

70.96532(54)#

p

70Kr

5/2−#

72Rb

37

35

71.95908(54)#

<1.5 µs

p

71Kr

3+#

72mRb

100(100)# keV

1# µs

p

71Kr

1−#

73Rb

37

36

72.95056(16)#

<30 ns

p

72Kr

3/2−#

74Rb

37

37

73.944265(4)

64.76(3) ms

β+

74Kr

(0+)

75Rb

37

38

74.938570(8)

19.0(12) s

β+

75Kr

(3/2−)

76Rb

37

39

75.9350722(20)

36.5(6) s

β+

76Kr

1(−)

β+, α (3.8×10−7%)

72Se

76mRb

316.93(8) keV

3.050(7) µs

(4+)

77Rb

37

40

76.930408(8)

3.77(4) min

β+

77Kr

3/2−

78Rb

37

41

77.928141(8)

17.66(8) min

β+

78Kr

0(+)

78mRb

111.20(10) keV

5.74(5) min

β+ (90%)

78Kr

4(−)

IT (10%)

78Rb

79Rb

37

42

78.923989(6)

22.9(5) min

β+

79Kr

5/2+

80Rb

37

43

79.922519(7)

33.4(7) s

β+

80Kr

1+

80mRb

494.4(5) keV

1.6(2) µs

6+

81Rb

37

44

80.918996(6)

4.570(4) h

β+

81Kr

3/2−

81mRb

86.31(7) keV

30.5(3) min

IT (97.6%)

81Rb

9/2+

β+ (2.4%)

81Kr

82Rb

37

45

81.9182086(30)

1.273(2) min

β+

82Kr

1+

82mRb

69.0(15) keV

6.472(5) h

β+ (99.67%)

82Kr

5−

IT (.33%)

82Rb

83Rb

37

46

82.915110(6)

86.2(1) d

EC

83Kr

5/2−

83mRb

42.11(4) keV

7.8(7) ms

IT

83Rb

9/2+

84Rb

37

47

83.914385(3)

33.1(1) d

β+ (96.2%)

84Kr

2−

β− (3.8%)

84Sr

84mRb

463.62(9) keV

20.26(4) min

IT (>99.9%)

84Rb

6−

β+ (<.1%)

84Kr

85Rb[n 4]

37

48

84.911789738(12)

Stable

5/2−

0.7217(2)

86Rb

37

49

85.91116742(21)

18.642(18) d

β− (99.9948%)

86Sr

2−

EC (.0052%)

86Kr

86mRb

556.05(18) keV

1.017(3) min

IT

86Rb

6−

87Rb[n 5][n 6][n 4]

37

50

86.909180527(13)

4.923(22)×1010 y

β−

87Sr

3/2−

0.2783(2)

88Rb

37

51

87.91131559(17)

17.773(11) min

β−

88Sr

2−

89Rb

37

52

88.912278(6)

15.15(12) min

β−

89Sr

3/2−

90Rb

37

53

89.914802(7)

158(5) s

β−

90Sr

0−

90mRb

106.90(3) keV

258(4) s

β− (97.4%)

90Sr

3−

IT (2.6%)

90 Rb

91Rb

37

54

90.916537(9)

58.4(4) s

β−

91Sr

3/2(−)

92Rb

37

55

91.919729(7)

4.492(20) s

β− (99.98%)

92Sr

0−

β−, n (.0107%)

91Sr

93Rb

37

56

92.922042(8)

5.84(2) s

β− (98.65%)

93Sr

5/2−

β−, n (1.35%)

92Sr

93mRb

253.38(3) keV

57(15) µs

(3/2−,5/2−)

94Rb

37

57

93.926405(9)

2.702(5) s

β− (89.99%)

94Sr

3(−)

β−, n (10.01%)

93Sr

95Rb

37

58

94.929303(23)

377.5(8) ms

β− (91.27%)

95Sr

5/2−

β−, n (8.73%)

94Sr

96Rb

37

59

95.93427(3)

202.8(33) ms

β− (86.6%)

96Sr

2+

β−, n (13.4%)

95Sr

96mRb

0(200)# keV

200# ms [>1 ms]

β−

96Sr

1(−#)

IT

96Rb

β−, n

95Sr

97Rb

37

60

96.93735(3)

169.9(7) ms

β− (74.3%)

97Sr

3/2+

β−, n (25.7%)

96Sr

98Rb

37

61

97.94179(5)

114(5) ms

β−(86.14%)

98Sr

(0,1)(−#)

β−, n (13.8%)

97Sr

β−, 2n (.051%)

96Sr

98mRb

290(130) keV

96(3) ms

β−

97Sr

(3,4)(+#)

99Rb

37

62

98.94538(13)

50.3(7) ms

β− (84.1%)

99Sr

(5/2+)

β−, n (15.9%)

98Sr

100Rb

37

63

99.94987(32)#

51(8) ms

β− (94.25%)

100Sr

(3+)

β−, n (5.6%)

99Sr

β−, 2n (.15%)

98Sr

101Rb

37

64

100.95320(18)

32(5) ms

β− (69%)

101Sr

(3/2+)#

β−, n (31%)

100Sr

102Rb

37

65

101.95887(54)#

37(5) ms

β− (82%)

102Sr

β−, n (18%)

101Sr

Observing the data table for 'Isotopes of rubidium' (see 'List of isotopes'), create one factual sentence about the highlighted cells, without adding extra data and provide it inside the JSON object {"answer": "YOUR ANSWER"}.