Question: what is the atomic number of the yet undiscovered element directly below ra in the periodic table
[{'answer': '120', 'provenance': [{'wikipedia_id': '68326', 'title': 'Extended periodic table', 'start_paragraph_id': 3, 'start_character': 820, 'end_paragraph_id': 3, 'end_character': 823, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '68326', 'title': 'Extended periodic table', 'start_paragraph_id': 74, 'start_character': 0, 'end_paragraph_id': 74, 'end_character': 903, 'bleu_score': 0.8836276046278471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16509057417560524116}, 'section': 'Section::::Predicted properties of eighth-period elements.:Chemical and physical properties.:Elements 119 and 120.\n'}]}]