Which ligand generates the smallest d-d splitting when bound to a transition metal and does not show electronic transitions in the visible light region

i look it up online and i'll tell you

b is the correct

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.