Question: what is an atom that has a charge called
[{'answer': 'ion', 'provenance': [{'wikipedia_id': '902', 'title': 'Atom', 'start_paragraph_id': 1, 'start_character': 170, 'end_paragraph_id': 1, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '902', 'title': 'Atom', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 650, 'bleu_score': 0.8201285971794041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13728405964431384569}, 'section': 'Section::::Abstract.'}]}]