d and f BLOCK ELEMENTS

Which of the following best describes the electronic configuration of actinoids?

• The 6d subshell is being filled
• The 5f subshell is being filled
• The 7s subshell is being filled
• The 4f subshell is being filled

Which of the following best describes the electronic configuration of lanthanoids?

• The 5d subshell is being filled
• The 4f subshell is being filled
• The 6s subshell is being filled
• The 3d subshell is being filled

What is a significant problem specifically associated with the study of actinoid chemistry?

• They are extremely rare
• Their high cost
• Their radioactivity
• They are all synthetic

What makes the chemistry of actinoids more complicated compared to lanthanoids?

• They are all gases
• They are less abundant
• Occurrence of a wide range of oxidation states
• They do not form compounds

What is the typical number of stable oxidation states exhibited by lanthanoids?

• One
• Two
• Three
• Four