Periodic Table/Lanthanum/¹²¹La

← 120La122La →

¹²¹La

Lanthanum-121

Radioactive· Half-life: 5.30 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

57

Neutrons (N)

64

Mass Number (A)

121

Atomic Mass

120.933236AMU

Spin / Parity

11/2-

Binding E/A

7.976keV

Natural Abundance

Trace / None

Half-life

5.30 s

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

β⁺

100.0%

β⁺p

Decay Chain

¹²¹LaLanthanum5.30 s

β⁺100.0%

β⁺p¹²⁰Cs

¹²¹BaBarium29.7 s

β⁺100.0%

β⁺p¹²⁰Xe0.02%

¹²¹CsCesium2.58 min

β⁺100.0%

¹²¹XeXenon40.1 min

β⁺100.0%

¹²¹IIodine2.12 h

β⁺100.0%

¹²¹TeTellurium19.3 d

β⁺100.0%

¹²¹SbAntimonySTABLE

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

Other Isotopes of Lanthanum

116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157

← Back to LanthanumData: IAEA NDS · ENSDF