Review Topics References] Use the References to access important values if neede

Question

Review Topics References] Use the References to access important values if needed for this question. The element lithium has two stable isotopes, lithium-7 with a mass of 7.016 amu and lithium-6 with a mass of 6.015 amu. From the atomic weight of Li 6.94 one can conclude that: O both sotopes have the same percent natural abundance O lithium-6 has the highest percent natural abundance O lithium-7 has the highest percent natural abundance O most lithium atoms have a mass of 6.94 amu Submit Answer Retry Entire Group 9 more group attempts remaining

Explanation / Answer

Answer

Lithium - 7 has highest percent natural abundance

Explanation

Atomic mass of Lithium equal to weight avarage of both isotope mass

Atomic mass of Li =( abundance fraction of Lithium-6 × 6.015amu) + (abundnce fraction of Lithium-7 × 7.016amu)

Atomic mass of Lithium is near to isotopic mass of Lithium-7

Therefore

Lithium - 7 has highest percent natural abundance

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