The last element of actinide series is:

• a.) Thorium
• b.) Cerium
• c.) Lawrencium
• d.) Lutetium

The last element of the actinide series is Lawrencium, which is represented by the symbol Lr and has the atomic number 103. The actinide series includes elements from actinium (Ac) to lawrencium, making lawrencium the final element in this series.

Understanding the Actinide Series

The actinide series consists of 15 elements, starting with actinium and ending with lawrencium. These elements are known for their radioactivity and are found in the f-block of the periodic table.

Key Characteristics

• All actinides are radioactive.
• They have similar properties, including the ability to form complex compounds.
• Many actinides are used in nuclear applications.

In summary, the correct answer to your question is c.) Lawrencium.