QUESTION 27 A certain element is composed of two isotopes, having the mass and abundance shown below. What is the average atomic mass for this element? Mass Abundance 921.9 u 36.0 u 37.0 u 35.5 u QUESTION 28 Isotope 1 35.0 u 75.8% Iso ope 2 37.0 u 24.2%

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A: When two atoms have same atomic number and different mass number, they are called as isotopes.

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