What do actinides share?
They all only share two main characteristics:1) they are all in the 7th row on the periodic table of elements (a full one, without the actinide and lanthanide groups seperated.)2) they are all radioactive.a debatable third is that they are all 5f block elements, though Lawrencium, which is actually a d block element, is generally accounted as an actinide, which is why this third point is debatable.