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  4. Lithium selenide can be described as a closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. Formula of lithium selenide is

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Q. Lithium selenide can be described as a closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. Formula of lithium selenide is

The Solid State

Solution:

($Li$ and $Se$) both ions are present in tetrahedral hole. Thus, its formula will be $Li_2Se$.