The History Of The Atom Flashcards
What did the plum pudding model show
The atom as a sphere of positive charge with electrons embedded into it
What is daltons model of the atom
Atoms as solid spheres that could not be divided into smaller parts
Describe the nuclear model of the atom
Dense nucleus with electrons orbiting it
What did Niels Bohr discover
Electrons orbit in fixed energy levels (shells)
What did James Chadwick discover
Uncharged particles called the neutron
What experiment did Ernest Rutherford and student Ernest marsden do
Alpha particle scattering experiments
What year was the alpha particle scattering experiments
1909
What did j j Thomson conclude in 1897
That atoms weren’t solid spheres and that his measurements of charge and mass showed that an atom must contain even smaller negatively charged particles
Who came up with the nuclear model
Rutherford
What does the nuclear model show
Tiny positively charged nucleus at the centre where most of the mass is concentrated
What did scientists discover in the alpha scattering experiment
Some alpha particles were deflected by the gold foil- this showed that an atoms mass and positive charge must be concentrated in one small space (the nucleus)
