d and f BLOCK ELEMENTS

What is the primary visual characteristic shared by actinoid metals?

• Brightly colored
• Dull and black
• Colorless
• Silvery appearance

Why might reviewing actinoid chemistry by oxidation state alone be misleading?

• Because all actinoids have the same oxidation states
• Because oxidation states are not important
• Because the stability and prevalence of oxidation states change dramatically across the series
• Because only +3 state exists

What is a general trend in the maximum oxidation state from Th to Np?

• It decreases
• It remains constant
• It fluctuates randomly
• It increases

Which actinoid is listed in Table 4.11 as showing an oxidation state of +5?

• Actinium (Ac)
• Thorium (Th)
• Uranium (U)
• Protactinium (Pa)

What irregularity in electronic configuration is associated with Americium (Am)?

• It has a completely filled 5f subshell
• It has no 5f electrons
• Its 5f subshell has 7 electrons
• Its 6d subshell is filled