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Identify Unknown Element Given Atomic Mass and Percent Abundance

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An unknown element is found to have three naturally occurring isotopes with the following information.

Atomic mass Percent abundance
35.9675 0.337%
37.9627 0.063%
39.9824 99.600%

Which of the follwoing is the unknown element?

a. Cl
b. Ca
c. K
d. Ar
e. None of these could be the unknown element.

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The solution identifies unknown elements given atomic mass and percent abundance

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