Neon-20 is a stable isotope of the chemical element neon, which has 10 neutrons in its atomic nucleus in addition to the element-specific 10 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 20. 20Ne represents by far the largest part of the three Ne isotopes occurring naturally on Earth (90.48%) (see below).
The discovery of neon-20 is attributed to the British Joseph John Thomson, who was the first to describe the observation of an isotope of a stable element (1913) and recognized that neon is composed of different isotopes [1].
See also: list of Neon isotopes.
Direct parent isotopes are: 20F, 20Na.
Atomic Mass ma | Quantity | Half-life | Spin | |
---|---|---|---|---|
Neon Isotopic mixture | 20.1797 u | 100 % | ||
Isotope 20Ne | 19.99244018(2) u | 90.48(3) % [88.47 - 90.51 %] | stable | 0+ |
Isotope 21Ne | 20.9938467(3) u | 0.27(1) % | stable | 3/2+ |
Isotope 22Ne | 21.9913851(2) u | 9.25(3) % | stable | 0+ |
Z | Isotone N = 10 | Isobar A = 20 |
---|---|---|
3 | 13Li | |
4 | 14Be | |
5 | 15B | 20B |
6 | 16C | 20C |
7 | 17N | 20N |
8 | 18O | 20O |
9 | 19F | 20F |
10 | 20Ne | 20Ne |
11 | 21Na | 20Na |
12 | 22Mg | 20Mg |
13 | 23Al | |
14 | 24Si | |
15 | 25P | |
16 | 26S |
[1] - Joseph John Thomson:
Bakerian Lecture: Rays of positive electricity.
In: Proceedings of the Royal Society A, 89, 607, (1913), DOI 10.1098/rspa.1913.0057.
Last update: 2024-10-22
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