Periodic Table/Sodium/²¹Na

← 20Na22Na →

²¹Na

Sodium-21

Radioactive· Half-life: 22.5 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

11

Neutrons (N)

10

Mass Number (A)

21

Atomic Mass

20.997654AMU

Spin / Parity

3/2+

Binding E/A

7.498keV

Natural Abundance

Trace / None

Half-life

22.5 s

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

β⁺

100.0%

Decay Chain

²¹NaSodium22.5 s

β⁺100.0%

²¹NeNeonSTABLE

2-step decay chain → stable · Primary path shown

Other Isotopes of Sodium

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

← Back to SodiumData: IAEA NDS · ENSDF