An isotope can be constituted-of-or-filled-with hydrogen.Logical formLearned from120 sentences. Information can be about isotopes.Logical formLearned from120 sentences. Isotopes can be heavy.Logical formLearned from116 sentences. Isotopes can be rare.Logical formLearned from106 sentences. Isotopes can be short-lived.Logical formLearned from105 sentences. A (radioactive isotope) can be rare.Logical formLearned from101 sentences. An isotope can be rare.Logical formLearned from84 sentences. Isotopes can be unstable.Logical formLearned from83 sentences. An isotope can be heavy.Logical formLearned from76 sentences. Isotopes may undergo a use.Logical formLearned from74 sentences. Isotopes can be constituted-of-or-filled-with hydrogen.Logical formLearned from71 sentences. An (isotope polonium-210) can be radioactive.Logical formLearned from70 sentences. Stable isotopes may undergo a use.Logical formLearned from68 sentences. Isotopes may pertain-to an element.Logical formLearned from65 sentences. A radioactive isotope can be constituted-of-or-filled-with hydrogen.Logical formLearned from65 sentences.