| 1. | Because of its instability, chemical studies of promethium are incomplete.
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| 2. | Other radioactive elements discovered in this star include technetium and promethium.
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| 3. | This same shot ignited his Promethium tanks, immolating the surrounding area.
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| 4. | The element promethium also draws its name from Greek mythology,
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| 5. | Thus it is the only promethium isotope with an experimentally observed alpha decay.
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| 6. | After creating a vacuum, the chemicals were mixed to produce promethium metal:
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| 7. | In 1963, promethium ( III ) fluoride was used to make promethium metal.
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| 8. | In 1963, promethium ( III ) fluoride was used to make promethium metal.
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| 9. | Uranium is thus " responsible " for 560 g promethium in Earth's crust.
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| 10. | Currently, Russia is the only country producing promethium-147 on a relatively large scale.
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