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Atomic: M.A.C. | Reference
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Reactions of Promethium
Reactions with acids
Promethium dissolves readily in dilute sulphuric acid to form solutions containing the pink aquated Pm(III) ion together with hydrogen gas.
  2Pm(s) + 3H2SO4(aq)2Pm3+(aq) + 3SO42-(aq) + 3H2(g)