Explanation:

Uranium-235 has 92 protons, so the proton number of 235U is 92. It has 92 protons plus 143 neutrons inside its nucleus, so it's total nucleon number is 235. Uranium-235 (235U) is an isotope of Uranium forming up about 0.72 percent of natural Uranium. Unlike that of predominant isotope Uranium238, it is much fissile, i.e., it may sustain a fission chain reaction. This is the only fissile isotope that is primordial and is found in relatively sufficient quantities in nature. Uranium-235 possesses a half-life of 703.8 million years. It was first discovered in 1935 by Arthur Jeffrey Dempster. Its fission cross-section for slow thermal neutrons is almost about 584.994 barns. For quick neutrons, it is on the order of 1 barn. Mostly but not all neutron absorptions result in fission; a minority even results in neutron capture making uranium-236. Uses: Uranium-235 has several uses, such as that of fuel for nuclear power plants and nuclear weapons such as nuclear bombs. Some artificial satellites, like the SNAP-10A and the RORSATs, were powered by nuclear reactors, which get fueled with U-235 satellites.