Neon (10Ne) possesses three stable isotopes:,, and . In addition, 17 radioactive isotopes have been discovered, ranging from to, all short-lived. The longest-lived is with a half-life of . All others are under a minute, most under a second. The least stable is with a half-life of . See isotopes of carbon for notes about the measurement. Light radioactive neon isotopes usually decay to fluorine or oxygen, while heavier ones decay to sodium.
|-| [1] | style="text-align:right" | 10| style="text-align:right" | 5| |
[{{val|590|(230)|u=keV}}]| 2p| | (3/2−)|||-| | style="text-align:right" | 10| style="text-align:right" | 6| | >
[< {{val|80|u=keV}}<!-- note: this value is the 3σ upper limit -->]| 2p| | 0+|||-| rowspan=4|[2] | rowspan=4 style="text-align:right" | 10| rowspan=4 style="text-align:right" | 7| rowspan=4|| rowspan=4|| β+p | | rowspan=4|1/2−| rowspan=4|| rowspan=4||-| β+α | |-| β+ | |-| β+pα | |-| | style="text-align:right" | 10| style="text-align:right" | 8| | | β+| | 0+| | |-| | style="text-align:right" | 10| style="text-align:right" | 9| | | β+| | 1/2+|||-| | style="text-align:right" | 10| style="text-align:right" | 10| | colspan=3 align=center|Stable| 0+| 0.9048(3)| [{{val|0.8847}}, {{val|0.9051}}][3] |-| | style="text-align:right" | 10| style="text-align:right" | 11| | colspan=3 align=center|Stable| 3/2+| | [{{val|0.0027}}, {{val|0.0171}}]|-| | style="text-align:right" | 10| style="text-align:right" | 12| | colspan=3 align=center|Stable| 0+| | [{{val|0.0920}}, {{val|0.0996}}]|-| | style="text-align:right" | 10| style="text-align:right" | 13| | | β−| | 5/2+|||-| | style="text-align:right" | 10| style="text-align:right" | 14| | | β−| | 0+| ||-| | style="text-align:right" | 10| style="text-align:right" | 15| | | β−| | 1/2+|||-| rowspan=2|| rowspan=2 style="text-align:right" | 10| rowspan=2 style="text-align:right" | 16| rowspan=2|| rowspan=2|| β− | | rowspan=2|0+| rowspan=2|| rowspan=2||-| β−n | |-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 17| rowspan=3|| rowspan=3|| β− | | rowspan=3|(3/2+)| rowspan=3|| rowspan=3||-| β−n | |-| β−2n ?[4] | ?|-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 18| rowspan=3|| rowspan=3|| β− | | rowspan=3|0+| rowspan=3|| rowspan=3||-| β−n | |-| β−2n | |-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 19| rowspan=3|| rowspan=3|| β− | | rowspan=3|(3/2−)| rowspan=3|| rowspan=3||-| β−n | |-| β−2n | |-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 20| rowspan=3|| rowspan=3|| β− | | rowspan=3|0+| rowspan=3|| rowspan=3||-| β−n | |-| β−2n | |-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 21| rowspan=3|| rowspan=3|| β−| | rowspan=3|(3/2−)| rowspan=3|| rowspan=3||-| β−n ?| ?|-| β−2n ?| ?|-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 22| rowspan=3|#| rowspan=3|| β−| | rowspan=3|0+| rowspan=3|| rowspan=3||-| β−n ?| ?|-| β−2n ?| ?|-| ?[5] | style="text-align:right" | 10| style="text-align:right" | 23| #| < | n ?| | 7/2−#|||-| rowspan=3|| rowspan=3 style="text-align:right" | 10| rowspan=3 style="text-align:right" | 24| rowspan=3|#| rowspan=3|# [> {{val|1.5|u=μs}}]| β− ?| | rowspan=3|0+| rowspan=3|| rowspan=3||-| β−2n ?| ?|-| β−n ?| ?|-