osmium [76]
oxygen [8]
palladium [46]
phosphorus [15]
platinum [78]
plutonium [94]
polonium [84]
potassium [19]
praseodymium [59]
promethium [61]
protactinium [91]
radium [88]
radon [86]
rhenium [75]
rhodium [45]
roentgenium [111]
rubidium [37]
ruthenium [44]
rutherfordium [104]

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