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(B) The first ionization energy of $3d$ transition elements generally increases across the period due to an increase in effective nuclear charge. Amon

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$Sc$

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(B) The first ionization energy of $3d$ transition elements generally increases across the period due to an increase in effective nuclear charge. Among the given elements ($Sc$,$Ti$,$V$,$Mn$),$Sc$ (atomic number $21$) is the first element in the $3d$ series. As we move from left to right across the $3d$ series,the effective nuclear charge increases,which leads to a stronger attraction between the nucleus and the valence electrons,thereby increasing the ionization energy. Therefore,$Sc$ has the lowest first ionization energy among the given options.

Among the following transition elements,which one has the lowest first ionization energy?

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