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A certain element X has four isotopes. • 51.45% of X has a mass of 89.90470 amu. has a mass of 90.90565 amu. • 11.22% of X • 17.15% of X has a mass of 91.90504 amu. • 17.38% of X has a mass of 93.90632 amu. What is the average atomic mass of element X? Express your answer numerically to four significant figures. ► View Available Hint(s) 88.54 amu Submit Previous Answers Correct Correct answer is shown. Your answer 88.5382 amu was either rounded differently or used a different number of significant figures than required for this part. Part C What is the identity of element X from Part B? Express your answer as a chemical symbol. ! You have already submitted this answer. Enter a new answer. No credit lost. Try again.