Question: help with 14 and 15 please! Your answer should include the proper number of significant figures and units. Question 15 A fictional element named Nivadium

help with 14 and 15 please!

Your answer should include the proper number of significant figures and units. Question 15 A fictional element named Nivadium is found to have three naturally occurring isotopes with the natural abundances shown here: The calculated atomic mass of Nivadium is

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