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12 terms

hard chem symbols

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Rubidium
Rb
Barium
Ba
Radon
Rn
Palladium
Pd
Ruthenium
Ru
Tantalum
Ta
Thorium
Th
Rhodium
Rh
Rhenium
Re
Radium
Ra
Tellurium
Te
Thallium
Tl