Answer:-)
Third principal shell (n = 3) has three subshells :
3 s , 3p and 3d.
s- subshell has one orbital.
p- subshell has three orbitals.
d- subshell has five orbitals.
Thus, total number of orbitals = (1 + 3 + 5) = 9
Hence, option A): "9" is correct answer.
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