Periodic Table/Oxygen/²¹O

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²¹O

Oxygen-21

Radioactive· Half-life: 3.42 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

8

Neutrons (N)

13

Mass Number (A)

21

Atomic Mass

21.008655AMU

Spin / Parity

5/2+

Binding E/A

7.195keV

Natural Abundance

Trace / None

Half-life

3.42 s

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

β⁻

100.0%

β⁻n

Decay Chain

²¹OOxygen3.42 s

β⁻100.0%

β⁻n²⁰F

²¹FFluorine4.16 s

β⁻100.0%

²¹NeNeonSTABLE

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

Other Isotopes of Oxygen

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

← Back to OxygenData: IAEA NDS · ENSDF