The Interpretation of Radium: And the Structure of the Atom

a-particle a-rays actinium active deposit actually amount appears argon atom of matter atomic disintegration atomic weight B-rays bismuth body chemist completely compounds containing decay definite detect discovery disintegration series effect electrons emana emanation of radium Ernest Rutherford evidence existence expelled experiments fact gases gives a-rays grain of radium heat helium hydrogen intermediate ionium isotopes known less light Loch Katrine magnet MAGNETIC DEVIATION mass material mesothorium metal methods milligram million Milngavie minutes molecule nucleus ordinary parent of radium particles penetrating period of average periodic table phosphorescent photographic physical science pitchblende plate polonium positive charge possible present properties proportion pure radium quantity of radium radiation radio radio-elements radioactive change radioactive elements radioactive substances radiothorium radium bromide radium emanation rays Rutherford screen separated spectrum SPINTHARISCOPE store of energy thallium thorium thorium series thousand tion transmutation tube uranium minerals velocity wave-length willemite X-rays y-rays