(D) The number of orbitals in a given energy level with principal quantum number $n$ is given by the formula $n^2$.For $n = 3,$ the number of orbitals

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(D) The number of orbitals in a given energy level with principal quantum number $n$ is given by the formula $n^2$.For $n = 3,$ the number of orbitals is $3^2 = 9$.These $9$ orbitals consist of $1$ orbital in the $3s$ subshell,$3$ orbitals in the $3p$ subshell,and $5$ orbitals in the $3d$ subshell $(1 + 3 + 5 = 9)$.