{"query": "Protactinium (Pa) — element 91", "count": 5, "results": [{"id": "card_ref_el_091", "title": "Protactinium (Pa) — element 91", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 91. Symbol Pa. Standard atomic weight 231.03588. The protactinium atom carries 91 protons in its nucleus; its place in the periodic table is fixed by that count. Verified reference data.", "authority_tier": "reference", "source": "Verified reference — chemistry", "generated": false}, {"id": "card_src_word_protactinium", "title": "protactinium", "shelf": "dictionary", "surface": "secular", "snippet": "protactinium: (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead — syn: protoactinium, Pa, atomic number 91", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_pa", "title": "pa", "shelf": "dictionary", "surface": "secular", "snippet": "pa: (noun) an informal term for a father; probably derived from baby talk — syn: dad, dada, daddy, papa, pappa, pop · (noun) a short-lived radioactive metallic element formed from uranium and disinteg", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_atomic_number_91", "title": "atomic number 91", "shelf": "dictionary", "surface": "secular", "snippet": "atomic number 91: (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead — syn: protactinium, protoactinium, Pa", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_protoactinium", "title": "protoactinium", "shelf": "dictionary", "surface": "secular", "snippet": "protoactinium: (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead — syn: protactinium, Pa, atomic number 91", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}]}