The Periodic Table and the Atom - The Development of the Model of the Atom Flashcards
what may new scientific evidence lead to in regards to scientific models
the models being changed or replaced
what were atoms thought to be before the discovery of the electron
tiny spheres that could not be divided
what did the discovery of the electron lead to visa vi the model of the electron
the plum pudding model, which suggested that the atom is a ball of positive charge with negative electrons embedded in it
what conclusion was drawn from the results of the alpha particle scattering experiment and how did this change the electron model
the mass of an atom was concentrated at the centre, the nucleus
This nuclear model replaced the plum pudding model
Who adapted the nuclear model by suggesting what
Niels Bohr
the electrons orbit the nucleus at specific distances
What idea was developed after the updated nucleus model and what was the name of the particles
the positive charge of any nucleus could be subdivided into a whole number of smaller particles each with the same amount of positive charge
These were called protons
Who proved the existence of neutrons within the nucleus and when did he do it
James Chadwick
20 years after the nucleus became an accepted idea
why did the scattering experiment lead to change in the atomic model
some alpha particles were being repelled by a tiny concentration of positive charge in the centre of the atom, e.g the nucleus
