Question

how did the electron change the model of the atom.

Answer 1

Better techniques to measure and and conduct experiments.

Answer 2

The main factor has been the evolution of quantum physics. In the early days of research into the structure of the atom Niels Bohr proposed a simple model of the atom with orbiting electrons circling a central nucleus. Similar in fact to a miniature planetary system. As quantum theory matured so also did the concept of the atomic structure. The idea that electrons had well defined orbits was no longer
compatible with the quantum viewpoint. The introduction of the uncertainty principle put paid to any notion of definite position at a precise time as did the observation that particles also displayed wave - like properties such as the diffraction of electron beams.
The emerging science of particle physics and the implications of quark theory were also factors which hastened the demise of the old model

[It's difficult to convey in a few sentences the changes that have taken place in nearly a century. However it is likely that the atom has still more secrets to reveal.]

Answer 3

http://answers.yahoo.com/question/index?qid=20090808164654AATS7JE

Answer 4

Thx :D

Answer 5

np :)