Periodic Table/Iodine/¹²⁸I

← 127I129I →

¹²⁸I

Iodine-128

Radioactive· Half-life: 25.0 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

53

Neutrons (N)

75

Mass Number (A)

128

Atomic Mass

127.905809AMU

Spin / Parity

1+

Binding E/A

8.221keV

Natural Abundance

Trace / None

Half-life

25.0 min

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

β⁻

93.1%

β⁺

6.9%

Decay Chain

¹²⁸IIodine25.0 min

β⁻93.1%

β⁺¹²⁸Te6.90%

¹²⁸XeXenonSTABLE

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

Other Isotopes of Iodine

106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147

← Back to IodineData: IAEA NDS · ENSDF