Thomson.* According to the theory of the latter the atom consists of a sphere of uniform positive electrification, inside which the electrons move in circular orbits. Instability of the system of electrons: difficulties purposely avoided in atom-models previously considered, for instance, in the one proposed by Sir J. In an attempt to explain some of the properties of matter on the basis of this atom-model we meet however, with difficulties of a serious nature arising from the apparent Great interest is to be attributed to this atom-model for, as Rutherford has shown, the assumption of the existence of nuclei, as those in question, seems to be necessary in order to account for the results of the experiments on large angle scattering of the a rays***. The number of electrons in an atom is deduced to be approximately equal to half the atomic weight. Further, the nucleus is assumed to be the seat of the essential part of the mass of the atom, and to have linear dimensions exceedingly small compared with the linear dimensions of the whole atom. According to this theory, the atoms consist of a positively charged nucleus surrounded by a system of electrons kept together by attractive forces from the nucleus the total negative charge of the electrons is equal to the positive charge of the nucleus. Rutherford** has given a theory of the structure of atoms. In order to explain the results of experiments on scattering of a rays by matter Prof. Bohr Model of the Atom On the Constitution of Atoms and Molecules
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