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The weighed average atomic mass of the naturally occurring element X is close to _______.

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An element, X has the following isotopic composition.

200X : 90% ; 199X : 8.0% ; 202X : 2.0%

The weighed average atomic mass of the naturally occurring element X is close to _______.

(A) 200 amu 

(B) 210 amu 

(C) 202 amu 

(D) 199 amu

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Correct option: (A) 200 amu 

Average atomic mass

= 199.96 ≈ 200

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