Determine free electrons per ge atom, Physics

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At 400.0 K, germanium has 1.13 x 10¹⁵ free electrons/cm³.

How many free electrons per Ge atom are there at this temperature?

At 400.0 K, silicon has 4.54 x 10¹² free electrons/cm³.

How many free electrons per Si atom are there at this temperature?

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