Naturally Occurring Element X Exists in Three Isotopic Forms: X-28

question 59

Multiple Choice

Naturally occurring element X exists in three isotopic forms: X-28 (27.979 u,90.64% abundance) ,X-29 (28.976 u,4.00% abundance) ,and X-30 (29.974 u,5.36% abundance) .Calculate the atomic weight of X.

• A) 29.64 u
• B) 28.13 u
• C) 28.99 u
• D) 29.83 u
• E) 27.15 u

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