Lawrencium
Lawrencium is a chemical element. It is also named eka-lutetium by some people. It has the symbol Lr. It has the atomic number 103. It is a radioactive element that does not exist in nature. It has to be made. Lawrencium is made from californium. The isotope that has the longest half-life (262Lr) has a half life of about 3.6 hours.