ISOTOPES
ISOTOPES
What is an isotope?
Isotopes are variations of an element; they have the same atomic number but a different atomic mass. Isotopes are usually more naturally abundant, meaning that they are more easier to find in nature than the actual elements themselves.
The following are the naturally abundant isotopes of Xenon:
|
Isotope |
Atomic
mass (ma/u) |
Natural
abundance (atom %) |
Nuclear
spin (I) |
Magnetic
moment (m/mN) |
|
124Xe |
123.9058942
(22) |
0.09
(1) |
0 |
|
|
126Xe |
125.904281
(8) |
0.09
(1) |
0 |
|
|
128Xe |
127.9035312
(17) |
1.92
(3) |
0 |
|
|
129Xe |
128.9047801
(21) |
26.44
(24) |
1/2 |
-0.777977 |
|
130Xe |
129.9035094
(17) |
4.08
(2) |
0 |
|
|
131Xe |
130.905072
(5) |
21.18
(3) |
3/2 |
0.691861 |
|
132Xe |
131.904144
(5) |
26.89
(6) |
0 |
|
|
134Xe |
133.905395
(8) |
10.44
(10) |
0 |
|
|
136Xe |
135.907214
(8) |
8.87
(16) |
0 |
|
Radiosotopes:
These are the unstable, radioactive isotopes of xenon:
| Isotope | Mass | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 122Xe | 121.9086 | 20.1 h | EC to 122I | 0 | |
| 123Xe | 122.90848 | 2.00 h | EC to 123I | 1/2 | |
| 125Xe | 124.906398 | 17.1 h | EC to 125I | 1/2 | |
| 127Xe | 126.905179 | 36.4 d | EC to 127I | 1/2 | -0.504 |
| 133Xe | 134.905906 | 5.243 d | b- to 133Cs | 3/2 | 0.813 |
| 135Xe | 134.90721 | 9.10 h | b- to 135Cs | 3/2 | 0.903 |
