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## GR0877 Problem 6

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (E) The $n$-th shell can accommodate $2n^2$ electrons. The factor 2 is due to the fact that each orbital can have at most two electrons (one spin up and one spin down). Thus, the total number of electrons is $2(1^2 + 2^2) = 2 \cdot 5 = 10$.

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