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What is promethium?

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... promethium , artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042°C; b.p. 3,000°C (estimated); sp. gr. unknown; valence +3.

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Magazine article from: Current Science, a Weekly Reader publication ...well. A nonmetal usually breaks easily, does not shine, and is a poor conductor of heat and electricity. 2. A. Pm is promethium and Po is polonium. 3. heat, 4. gravity. On the moon, astronauts weigh one-sixth their normal weight because the moon...
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