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CHAPTER IAOIS I Introductory
The Periodic Law
Electrons and Nuclei
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a-particles amount of energy amount of flattening atomic number atomic weight body Bohr Bohr's theory called centimetre chapter complex atoms consists discovered eccentric orbits Einstein elec electron moves ellipse elliptic orbits emits explained fact four hydrogen nuclei frequency happens helium atom helium nucleus hydro hydrogen atom hydrogen spectrum increases inert gas inner rings interval jumps kinetic energy known less light-waves mathematical ment motion multiplied negative electricity Niels Bohr number of electrons observer optical spectra outer ring particles passing perihelion periodic law periodic process periodic table physics Planck's quantum planets positive electricity positively electrified possible orbits principle proper mass quantum theory quantum-principle radio-activity radius result rings of electrons round the nucleus Rydberg's constant smallest solar system Sommerfeld sort space spectral lines spectroscope structure supposed theory of relativity total quantum number tricity tron uranium velocity of light wave wave-lengths wave-number whole number X-ray spectra