Periodic Table/Erbium/¹⁴⁹Er

← 148Er150Er →

¹⁴⁹Er

Erbium-149

Radioactive· Half-life: 4.00 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

68

Neutrons (N)

81

Mass Number (A)

149

Atomic Mass

148.942306AMU

Spin / Parity

1/2+

Binding E/A

7.842keV

Natural Abundance

Trace / None

Half-life

4.00 s

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

β⁺

100.0%

β⁺p

7.0%

Decay Chain

¹⁴⁹ErErbium4.00 s

β⁺100.0%

β⁺p¹⁴⁸Dy7.00%

¹⁴⁹HoHolmium21.1 s

β⁺100.0%

¹⁴⁹DyDysprosium4.20 min

β⁺100.0%

¹⁴⁹TbTerbium4.12 h

β⁺83.3%

α¹⁴⁵Eu16.7%

¹⁴⁹GdGadolinium9.28 d

β⁺100.0%

α¹⁴⁵Sm4.30%

¹⁴⁹EuEuropium93.1 d

EC100.0%

¹⁴⁹SmSamariumSTABLE

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

Other Isotopes of Erbium

142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180

← Back to ErbiumData: IAEA NDS · ENSDF