Question
What are the different ways of heat transfer?
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| Shell | $n$ | $2n^2$ | Electron holding capacity |
| $K$ | ______ | $2 \times 1^2$ | $2$ |
| $L$ | $2$ | ______ | $8$ |
| ______ | $3$ | $2 \times 3^2$ | $18$ |
| $N$ | $4$ | $2 \times 4^2$ | ______ |