˹á arrow R
˹áԧʹԴ
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ѤҪԡ
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ʶԵԼ
: 2280201 
й 4 ؤŷ ͹Ź
R
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Radiation 1211
Radiation 718
Radioactive 709
Radioactive Decay 888
Radioactivity 742
Radium 1396
Radon 912
Rare Earth Metals 631
Rate Constant 1203
Rate Law 1429
Rate Reaction 784
Reactants 808
Redox Reaction 1218
Reducing Reagent 1114
Representative Element 1506
Resonance 1086
Resonance Hybrid 1513
Resonance Structure 1383
Reverse Reaction 754
Reversible Reaction 1206
Rhenium 779
Rhodium 1376
Round bottomed flask:ⷡ鹡 1726
Rubidium 1004
Ruthenium 1068
Rutherfordium 966