Question: how many valence electrons do the elements in group 17 have
[{'answer': '7', 'provenance': [{'wikipedia_id': '568674', 'title': 'Valence electron', 'start_paragraph_id': 12, 'start_character': 889, 'end_paragraph_id': 12, 'end_character': 890, 'bleu_score': 1.0, 'section': 'Section::::Electron configuration.\n'}]}]