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

Let’s say I eat half of a pizza. And then I eat half of what’s left. Continuing to only eat half of what is leftover will go on forever, and so the “full-life” of the pizza is infinite. Inifity doesn’t help distinguish between things, so I might as well just tell you how long it took to eat the first half.