| 3C 234 | |
|---|---|
 | |
| Observation data (Epoch J2000) | |
| Constellation | Leo Minor |
| Right ascension | 10h 01m 49.501s [1] |
| Declination | +28° 47′ 08.98″ [1] |
| Redshift | 0.184925 [2] |
| Distance | 733 megaparsecs (2.39×109 ly) h −1 0.73 [2] |
| Type | Sy1, Rad, AGN, QSO, IR, G, blu, X, gam [1] G [2] |
| Apparent magnitude (V) | 17.27 [1] |
| Other designations | |
| DA 280, LEDA 139234, 4C 29.35, QSO B0958+290 | |
| See also: Quasar, List of quasars | |
3C 234 is a Seyfert galaxy [1] with a quasar-like appearance located in the constellation Leo Minor.
Protactinium is a radioactive chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds in which protactinium is usually present in the oxidation state +5, but it can also assume +4 and even +3 or +2 states. Concentrations of protactinium in the Earth's crust are typically a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits. Because of its scarcity, high radioactivity and high toxicity, there are currently no uses for protactinium outside scientific research, and for this purpose, protactinium is mostly extracted from spent nuclear fuel.
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