Question: smallest unit that consist of at least one atom
[{'answer': 'molecules', 'provenance': [{'wikipedia_id': '902', 'title': 'Atom', 'start_paragraph_id': 4, 'start_character': 325, 'end_paragraph_id': 4, 'end_character': 334, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '902', 'title': 'Atom', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 492, 'bleu_score': 0.645155854796989, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8875798635907548438}, 'section': 'Section::::Abstract.'}]}]