(A) The magnetic quantum number $m_l$ depends on the azimuthal quantum number $l$,where $m_l$ ranges from $-l$ to $+l$.For an $s$-orbital,$l = 0$,so $

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(A) The magnetic quantum number $m_l$ depends on the azimuthal quantum number $l$,where $m_l$ ranges from $-l$ to $+l$.For an $s$-orbital,$l = 0$,so $m_l$ can only be $0$.Since the given value is $m_l = -1$,it is impossible for an electron to be in an $s$-orbital because $m_l$ cannot be $-1$ when $l = 0$.Therefore,the correct option is $A$.