Periodic Table/Krypton/⁹⁹Kr

← 98Kr100Kr →

⁹⁹Kr

Krypton-99

Radioactive· Half-life: 40.0 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

36

Neutrons (N)

63

Mass Number (A)

99

Atomic Mass

98.958776AMU

Spin / Parity

5/2-

Binding E/A

7.989keV

Natural Abundance

Trace / None

Half-life

40.0 ms

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁻

100.0%

β⁻n

11.0%

2n

Decay Chain

⁹⁹KrKrypton40.0 ms

β⁻100.0%

β⁻n⁹⁸Rb11.0%

2n⁹⁷Kr

⁹⁹RbRubidium54.0 ms

β⁻100.0%

β⁻n⁹⁸Sr17.3%

2n⁹⁷Rb

⁹⁹SrStrontium269 ms

β⁻100.0%

β⁻n⁹⁸Y0.10%

⁹⁹YYttrium1.48 s

β⁻100.0%

β⁻n⁹⁸Zr1.77%

⁹⁹ZrZirconium2.10 s

β⁻100.0%

⁹⁹NbNiobium15.0 s

β⁻100.0%

⁹⁹MoMolybdenum2.75 d

β⁻100.0%

⁹⁹TcTechnetium211 ky

β⁻100.0%

⁹⁹RuRutheniumSTABLE

9-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Krypton

67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101

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