Anewly discovered element, y, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. what is the weighted average atomic mass for this element? 269.4 u 268.1 u 269.0 u 270.6 u

268.1 u

Explanation:

Mass of isotope 1 = 267.8 u

% abundance of isotope 1 = 90.3% =

Mass of isotope 2 = 270.9 u

% abundance of isotope 2 = 9.7% =

Formula used for average atomic mass of an element :

Therefore, the average atomic mass of an element is, 268.1 u

b

explanation:

mitosis

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