Different isotopes of protactinium were identified in Germany in 1913 and in 1918, but the name " protactinium " was not given until 1948.
42.
Next, with a short half-life, Th-234 nuclei emit a beta particle to become protactinium-234 ( Pa-234 ).
43.
They planned to separate and store protactinium-233, so it could decay to uranium-233 without being destroyed by neutron capture in the reactor.
44.
Protactinium bromides are produced by the action of aluminium bromide, hydrogen bromide, carbon tetrabromide or a mixture of hydrogen bromide and thionyl bromide on protactinium oxide.
45.
Protactinium bromides are produced by the action of aluminium bromide, hydrogen bromide, carbon tetrabromide or a mixture of hydrogen bromide and thionyl bromide on protactinium oxide.
46.
Among those, most remarkable is Na 3 PaF 8 where protactinium ion is symmetrically surrounded by 8 F " ions which form a nearly perfect cube.
47.
The only naturally occurring isotopes are 231 Pa, which occurs as an intermediate decay product of 238 U . 231 Pa makes up nearly all natural protactinium.
48.
The hydride is obtained by direct action of hydrogen on the metal at 250 �C, and the nitride is a product of ammonia and protactinium tetrachloride or pentachloride.
49.
Twenty nine isotopes of protactinium are known with mass numbers 212 240 as well as three excited ?-emitter with a half-life of 26.97 days.
50.
In a simplified scenario, lithium selectively reduces protactinium salts to protactinium metal which is then extracted from the molten-salt cycle, and bismuth is merely a carrier.
