What is the atomic number of Lawrencium, a chemical element that is classified as the last member of the actinides?

The correct answer is option 2.

Key Points

• Lawrencium is a chemical element with the symbol Lr and atomic number 103.
• It is classified as the last member of the actinide series.
• Lawrencium was first synthesized in 1961 by the Lawrence Berkeley National Laboratory.
• It is a synthetic element, which means it is not found naturally and must be created in a laboratory.

Additional Information

• The actinides are a series of 15 metallic elements from actinium (Ac) to lawrencium (Lr) in the periodic table.
• Lawrencium's most stable isotope is Lr-262, which has a half-life of about 3.6 hours.
• The element is named after Ernest Lawrence, the inventor of the cyclotron, a type of particle accelerator.
• As a synthetic element, lawrencium is primarily used for research purposes and has no significant commercial applications.
• Lawrencium, like other actinides, exhibits radioactive properties and must be handled with special precautions in a laboratory setting.