Principal quantum number 3 refers to:

m - main shell

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f - sub shell

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n - main shell

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d - sub-shell

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Solution

The correct option is C d - sub-shell
The symbol $n$ stands for principal quantum number. It represents the relative energy of each orbital. principal quantum number $= 3$ indicates the third principle shell i.e d subshell is the main shell.

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n

^{3} +

(n + l)

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