Question: what does cu on the periodic table mean
[{'answer': 'copper', 'provenance': [{'wikipedia_id': '23290471', 'title': 'Group 11 element', 'start_paragraph_id': 1, 'start_character': 106, 'end_paragraph_id': 1, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23290471', 'title': 'Group 11 element', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 534, 'bleu_score': 0.977897140678983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14961787610582629962}, 'section': 'Section::::Abstract.'}]}]