Question: what element is in period 3 group 2
[{'answer': 'Magnesium', 'provenance': [{'wikipedia_id': '195729', 'title': 'Period 3 element', 'start_paragraph_id': 7, 'start_character': 11, 'end_paragraph_id': 7, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Elements.:Sodium.\n'}]}]