1. For one atom of lithium -6 I will need atom of lithium -7 for an average atomic mass of 6.944? 2. For one atom of lithium -6 needed Adams of lithium -7 for an average atomic mass of 6.944.

For one atom of lithium -6 I will need_16.85____ atom of lithium -7 for an average atomic mass of 6.944 .

Explanation:

1 ) Let required atom be m .

6 + 7m = 6.944 + 6.944m

7 m - 6.944 m = .944

.056 m = .944

m = 16.85

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