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(A) The $2s$ orbital is spherically symmetric,meaning its orbital angular momentum quantum number $l = 0$.For an $s$ orbital,the magnetic quantum numb

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$1$

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(A) The $2s$ orbital is spherically symmetric,meaning its orbital angular momentum quantum number $l = 0$.For an $s$ orbital,the magnetic quantum number $m_l$ can only be $0$,which corresponds to only $1$ orientation in space.The electron in the $2s$ orbital of a lithium atom can have two possible spin states,$m_s = +\frac{1}{2}$ or $m_s = -\frac{1}{2}$.However,the question asks for the rotational orientations of the electron in the $2s$ orbital,which is determined by the magnetic quantum number $m_l$.Since $l = 0$,$m_l = 0$,there is only $1$ permissible orientation.

The maximum number of permissible rotational orientations of the $2s$ electron of lithium atom in ground state is

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