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並前往https://byjus.com/question-answer/an-element-x-has-the-following-isotopic-composition-200-textrm-x-90-199-textrm-x-1/

An element X has the following isotopic composition - Byju's

The weighted average atomic mass of the naturally occurring element X is closest to:A. 201 amuB. 202 amuC. 199 amuD. 200 amu.

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