What is the reason radioactive decay is measured in half-life’s instead of just using the elements “full-life”?

Question

Is there something special about the halfway point? Does the decay happen at a steady pace or exponentially?

In: 910

Answer 1

Because it is random it never totally decays so there is no full life. So if you have an element with a half life of a year, after a year half of it would have decayed, then over another year a half of the remaining will have decayed so you still have a quarter still yet to decay another year an eighth remains another year a sixteenth continuing on forever. https://youtu.be/AaDwk8UCrew