d and f BLOCK ELEMENTS

What is a significant consequence of Lanthanoid Contraction?

• It increases the basicity of lanthanoid hydroxides.
• It causes the radii of the third transition series elements to be very similar to the corresponding elements of the second transition series.
• It leads to an increase in metallic bonding strength.
• It results in larger differences in ionic radii between consecutive lanthanoids.

Which of the following oxometal anions features a transition metal in an oxidation state equal to its group number?

• CrO₄²⁻
• VO₃⁻
• MnO₄⁻
• TiO₃²⁻

What is the most stable oxidation state for an element with a 3d⁵ ground state electron configuration?

• +3
• +5
• +2
• +7

How do electronic configurations primarily influence the stability of oxidation states in the first transition series?

• By determining the atomic mass.
• By influencing the metallic radius.
• By achieving half-filled or completely filled d subshells.
• By affecting the electronegativity values.

In the first transition series, why does the +2 oxidation state become more stable across the first half (from Sc to Mn)?

• The number of d electrons decreases.
• The atomic radius increases significantly.
• The increasing nuclear charge makes it harder to remove the third electron.
• The ionization energy decreases.