Periodic Table/Boron/²¹B

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²¹B

Boron-21

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

5

Neutrons (N)

16

Mass Number (A)

21

Atomic Mass

21.084147AMU

Spin / Parity

3/2-

Binding E/A

4.031keV

Natural Abundance

Trace / None

Half-life

Unknown

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

2n

100.0%

Decay Chain

2n100.0%

¹⁹BBoron2.92 ms

β⁻100.0%

β⁻n¹⁸C71.0%

2n¹⁷B17.0%

3n¹⁶B9.10%

¹⁹CCarbon46.2 ms

β⁻100.0%

β⁻n¹⁸N47.0%

2n¹⁷C7.00%

¹⁹NNitrogen336 ms

β⁻100.0%

β⁻n¹⁸O41.8%

¹⁹OOxygen26.5 s

β⁻100.0%

¹⁹FFluorineSTABLE

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

Other Isotopes of Boron

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

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