Let's determine what the splitting of an atom leads to.
The splitting of an atom can lead to nuclear fission.
Nuclear fission can be defined as a reaction whereby the nucleus of an atom splits into two or more smaller nuclei.
The Nuclear fission produces atomic bomb.
The splitting of an atom can be said to lead to an atomic bomb which causes explosion.
Therefore, we can say the splitting of an atom leads to atomic bomb.
ANSWER:
Atomic bomb