d and f BLOCK ELEMENTS

Why do transition metals form a large number of complex compounds?

• Comparatively smaller sizes of metal ions
• High ionic charges
• Availability of d orbitals
• All of the above

What is the main reason transition metal ions form coloured solutions?

• Presence of s electrons
• Presence of completely filled d orbitals
• Presence of partially filled d orbitals allowing d-d transitions
• Presence of f electrons

Why is the Sc3+ ion colourless?

• It has a completely filled 3d subshell
• It has paired electrons
• It has an empty 3d subshell (3d0)
• It is paramagnetic

Why is the Zn2+ ion colourless?

• It has no d electrons
• It has one unpaired electron
• It has a completely filled 3d subshell (3d10)
• It is diamagnetic

Which electronic configuration would most likely result in a colourless ion?

• 3d1
• 3d5
• 3d0
• 3d9