d and f BLOCK ELEMENTS

What is a significant consequence of the similar energies of the 5f, 6d, and 7s orbitals in actinoids?

• It leads to increased overall stability
• It results in simpler chemical reactions
• It enables the stabilization of a greater variety of oxidation states
• It causes lower overall reactivity

Which actinoid is specifically mentioned in the text as achieving a maximum oxidation state of +7?

• Plutonium (Pu)
• Uranium (U)
• Protactinium (Pa)
• Neptunium (Np)

Compared to lanthanoids, what is a major distinguishing feature of actinoid oxidation states?

• Actinoids only ever show the +3 state
• Actinoids show fewer oxidation states than lanthanoids
• Lanthanoids exhibit a wider range of oxidation states
• Actinoids exhibit a significantly wider range of accessible oxidation states

Which electron subshell is formally filled last in the progression of the actinoid series?

• 6d
• 7s
• 4f
• 5f

What is a common chemical tendency observed for both +3 and +4 actinoid ions?

• They are highly stable in aqueous water
• They are typically colorless in solution
• They do not readily form complexes
• They have a tendency to undergo hydrolysis