When the nucleus of a U-235 atom captures a moving neutron it splits in two (fissions) and releases some energy in the form of heat, also two or three additional neutrons are thrown off.magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.The isotope U-235 is important because under certain conditions it can readily be split, yielding a lot of energy.It is therefore said to be 'fissile' and we use the expression 'nuclear fission'.
Nevertheless it generates 0.1 watts/tonne as decay heat and this is enough to warm the Earth's core. The nucleus of the U-235 atom comprises 92 protons and 143 neutrons (92 143 = 235).
Has there been any way to express the number of protons in an atom? Protons and neutrons are also known as the nucleons.
Since an atom having no charge, means the number of electrons must be equal to the number of protons that is the atomic number.
Hence, the sum of number of proton and neutron is known as mass number.
The number of neutrons, N, is known as the number of neutrons in an atom.