If you think to a picrate (a salt of picric acid), yes: an uranyl picrate exist.
Pyrate
What is iron pyrites?
1. Yes, all coals contain traces of uranium. 2. Uranium is not combustible; the "burning" of uranium in nuclear reactors is a nuclear reaction, not a reaction with oxygen.
A nuclear fission reaction.
Mainly because only about 0.7% of uranium is the isotope uranium-235, which is easily fissionable. It is believed that in Earth's remote past, there were such chain reactions - natural reactors - at a time when the percentage of U-235 was higher.
The nuclear fission of uranium is a reaction with neutrons.
pyrate
Uranium
Any reaction.
Uranium metal (enriched in uranium-235 up to 99 %) is a nuclear explosive, if the critical mass is reached. Also criticality accidents are possible in uranium plants or uranium storage areas.
The element is determined by the number of protons. When uranium captures a fast neutron it is still uranium but has an increased atomic mass. Fast neutron capture may encourage a further reaction but it depends on which uranium isotope you start with as to the increase in probability some further reaction will occur and which reaction that might be.
Nuclear fuel rods contain uranium pellets for the fission reaction. The uranium pellets undergo a controlled chain reaction in a nuclear reactor, releasing heat energy that is used to generate electricity.