In the given nuclear fission reaction, a neutron (which is a neutral particle) hits a uranium nucleus (which is a positively charged particle due to protons). The fission process leads to the formation of additional smaller nuclei, which generally contain a mix of positive and neutral particles.
Given this context, the statement that best describes the charges of the particles involved is:
A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
This accurately reflects that the neutron (neutral particle) interacts with the uranium nucleus (positive particle), causing it to split into smaller nuclei that consist of both neutral and positive particles.