Periodic Table/Helium/⁹He

← 8He10He →

⁹He

Helium-9

Radioactive· Half-life: 2.50 zs

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

2

Neutrons (N)

7

Mass Number (A)

9

Atomic Mass

9.043946AMU

Spin / Parity

1/2

Binding E/A

3.236keV

Natural Abundance

Trace / None

Half-life

2.50 zs

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

n

100.0%

Decay Chain

⁹HeHelium2.50 zs

n100.0%

⁸HeHelium120 ms

β⁻100.0%

β⁻n⁷Li16.0%

B-t⁵He0.90%

⁸LiLithium839 ms

β⁻100.0%

β⁻α⁴He100.0%

⁸BeBeryllium81.9 as

α100.0%

⁴HeHeliumSTABLE

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

Other Isotopes of Helium

3 4 5 6 7 8 9 10

← Back to HeliumData: IAEA NDS · ENSDF