ELEMENTS NOT DETECTED IN STELLAR SPECTRA
The table which follows contains a list of elements which are absent, or of doubtful occurrence. The rare earths are omitted from the list.
The elements marked “doubtful” in the list are those for which coincidences with very faint solar lines occur.[354] Twelve out of the twenty-nine elements enumerated are halogens, inert gases, or metalloids, and it is significant that all the elements of these groups are absent, with the sole exception of helium.
| At. No. | Element | Remark | At. No. | Element | Remark |
|---|---|---|---|---|---|
| 4 | Beryllium | Doubtful | 53 | Iodine | Absent |
| 5 | Boron | Absent | 54 | Xenon | Absent |
| 9 | Fluorine | Absent | 73 | Tantalum | Doubtful |
| 10 | Neon | Absent | 74 | Tungsten | Doubtful |
| 15 | Phosphorus | Absent | 76 | Osmium | Doubtful |
| 17 | Chlorine | Absent | 77 | Iridium | Doubtful |
| 18 | Argon | Absent | 78 | Platinum | Doubtful |
| 32 | Germanium | Doubtful | 79 | Gold | Absent |
| 33 | Arsenic | Absent | 80 | Mercury | Doubtful |
| 34 | Selenium | Absent | 81 | Thallium | Doubtful |
| 35 | Bromine | Absent | 83 | Bismuth | Doubtful |
| 36 | Krypton | Absent | 86 | Radon | Absent |
| 49 | Indium | Doubtful | 90 | Thorium | Doubtful |
| 51 | Antimony | Absent | 92 | Uranium | Doubtful |
| 52 | Tellurium | Absent |
FOOTNOTES:
[125] M. N. R. A. S., 83, 166, 1923; ibid., 84, 368, 1924.
[126] Ap. J., 61, 38, 1925.
[127] Wright, Lick Pub., 13, 242, 1918.
[128] A. Fowler, M. N. R. A. S., 80, 692, 1920.
[129] H. A., 91, 7, 1918.