Periodic Table/Promethium/¹²⁸Pm

← 127Pm129Pm →

¹²⁸Pm

Promethium-128

Radioactive· Half-life: 1.00 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

61

Neutrons (N)

67

Mass Number (A)

128

Atomic Mass

127.948234AMU

Spin / Parity

4+

Binding E/A

7.832keV

Natural Abundance

Trace / None

Half-life

1.00 s

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

β⁺

100.0%

β⁺p

p

0.0%

Decay Chain

¹²⁸PmPromethium1.00 s

β⁺100.0%

β⁺p¹²⁷Pr

p¹²⁷Nd0.00%

¹²⁸NdNeodymium?

β⁺

¹²⁸PrPraseodymium2.85 s

β⁺100.0%

β⁺p¹²⁷La

¹²⁸CeCerium3.93 min

β⁺100.0%

¹²⁸LaLanthanum5.18 min

β⁺100.0%

¹²⁸BaBarium2.43 d

EC100.0%

¹²⁸CsCesium3.64 min

β⁺100.0%

¹²⁸XeXenonSTABLE

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

Other Isotopes of Promethium

126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165

← Back to PromethiumData: IAEA NDS · ENSDF