{"query": "Hafnium (Hf) — element 72", "count": 6, "results": [{"id": "card_ref_el_072", "title": "Hafnium (Hf) — element 72", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 72. Symbol Hf. Standard atomic weight 178.49. The hafnium atom carries 72 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_hafnium", "title": "hafnium", "shelf": "dictionary", "surface": "secular", "snippet": "hafnium: (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons — syn: Hf, atomic numb", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_hf", "title": "hf", "shelf": "dictionary", "surface": "secular", "snippet": "hf: (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons — syn: hafnium, atomic numb", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_drug_hafnium", "title": "Hafnium", "shelf": "medicine", "surface": "secular", "snippet": "Hafnium: a HUMAN OTC DRUG, pellet given by the oral route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_pron_hafnium", "title": "hafnium", "shelf": "pronunciation", "surface": "secular", "snippet": "hafnium: pronounced (ARPABET) HH AE1 F N IY0 AH0 M. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "generated": false}, {"id": "card_src_word_atomic_number_72", "title": "atomic number 72", "shelf": "dictionary", "surface": "secular", "snippet": "atomic number 72: (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons — syn: hafniu", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}]}