Which statement is correct about nuclear FISSION?

Nuclear fission only occurs in stars.
Nuclear fission occurs when two atoms slam together to form one, heavier atom
nuclear fission occurs in the nuclei of atoms
nuclear fission is commonly fueled by iron

The statement "Nuclear fission occurs in the nuclei of atoms" is correct about nuclear fission.

The correct statement about nuclear fission is that it occurs in the nuclei of atoms.

The correct statement about nuclear fission is that it occurs in the nuclei of atoms. Nuclear fission is a process where the nucleus of an atom splits into smaller fragments, releasing a large amount of energy. This process is usually induced by bombarding the nucleus with a neutron, which causes it to become unstable and split into two or more smaller nuclei. The statement that nuclear fission only occurs in stars is incorrect because it can also occur artificially in nuclear reactors. The statement about two atoms slamming together to form a heavier atom is not accurate because that process is known as nuclear fusion, not nuclear fission. Additionally, the statement that nuclear fission is commonly fueled by iron is incorrect. Nuclear fission can be fueled by various isotopes, such as uranium-235 or plutonium-239, but not iron.