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

Draw a line.

Now Draw a midpoint.

Draw a midpoint of half of that line.

Draw a midpoint of half of that line.

Keep going and let me know when you run out of midpoints.

Practically, you’ll eventually run out of space depending how thick your lead is. But for decay, you’ll be waiting for the heat death of the universe to see that very last atom finally poop out a proton.