Question: the average of the masses of all the atoms in a sample of an element is called
[{'answer': 'Relative atomic mass', 'provenance': [{'wikipedia_id': '213968', 'title': 'Relative atomic mass', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'atomic weight', 'provenance': [{'wikipedia_id': '213968', 'title': 'Relative atomic mass', 'start_paragraph_id': 1, 'start_character': 38, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '213968', 'title': 'Relative atomic mass', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 0.533281582518065, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5855354586848183947}, 'section': 'Section::::Abstract.'}]}]