RdAc

noun

Elementary

1

Abbreviation of radioactinium.

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r R&AW R&B R&D R&Ds R&F R&G R&M R&O R'R'dg r's r*pe R-1 R-R R-Rs r.r.e.R.I.R.N.R.R.R.S.R.V.R/C

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