Why has the bohr-sommerfeld model of the atom been ignoredby general chemistry textbooks?

Bohr's model of the atom is considered to be important by general chemistry textbooks. A major shortcoming of this model was that it could not explain the spectra of atoms containing more than one electron. In order to increase the explanatory power of the model, Sommerfeld hypothesized the existence of elliptical orbits.

Did Columbus hypothesize or predict that if he sailed due west, he would arrive at the Indies?

A review of the literature in science education shows that most students have difficulties in hypothetico-deductive reasoning. The author's objective in this study was to investigate the abilities of high school teachers and university teachers to understand the difference between the terms hypothesis and prediction in the everyday context of Columbus's discovery of America. The author asked 83 high school and university teachers enrolled in a methodology course to elaborate and to explain a prediction and a hypothesis based on Columbus's discovery.

Achievement in chemistry problem-solving as a function of the mobility-fixity dimension.

The present studies explored the relation between students' achievement in chemistry problem-solving and the Mobility-Fixity dimension. Fixity characterizes consistency of function of field-independent subjects in a field-independent fashion, while Mobility provides for variation according to circumstances. The effect of this cognitive variable was examined as a function of the type and the complexity of the problem.