The story of atomic energy

a-particles a-rays acid actinium active deposit artificial Aston atomic energy atomic number atomic theory atomic weight Bohr bombarding carbon carbon group century chemical character chemistry chemists collision combustion completely compounds cyclotron Dalton deuterons discovery disintegration Displacement Law electric electromagnetic elements exist experimental fission gases give Group heat helium Higgins hydrogen increase ionisation ions isotope of mass isotopes J. J. Thomson kinetic energy known later light lithium magnetic mass number matter metals methods mineral molecular molecules natural negative electrons negatron Neptunium neutrons nitrogen nuclear nucleus orbit ordinary original oxygen particles Periodic Law Periodic Table photographic physical plutonium polonium positron possible produced proportion proton pure quantity quantum theory radiation radio-elements radioactive radium radon rays regarded result Rutherford separate shows spectra spectrum sulphur temperature termed thorium tion tomic bomb transmutation tube unit uranium uranium pile velocity wavelength X-rays y-rays zero