RUTHERFORD'S MODEL (PROTONS AND ELECTRONS)
http://upload.wikimedia.org/wikipedia/commons/7/7d/Rutherfordsches_Atommodell.png
As explained in section Rutherford's Experiment, Rutherford discovered that there was a cluster of matter at the center of an atom that his alpha particles bounced off.
However, he thought that this cluster, dubbed the nucleus, was composed solely of protons, or particles with a charge of +1.
However, he thought that this cluster, dubbed the nucleus, was composed solely of protons, or particles with a charge of +1.
CHADWICK'S MODEL (PROTONS, NEUTRONS, AND ELECTRONS)
http://wiki.nisk.k12.ny.us/groups/84physicalscience/wiki/cc07b/Chadwick_7th_Per.html
James Chadwick, who collaborated with Rutherford, found an unknown particle in the nucleus, as explained in section Chadwick's Experiment.
This particle had already been theorized by Rutherford, but Chadwick showed that the neutron was not made of a proton and electron together, but rather a different particle entirely.
A neutron is slightly more massive than a proton and has the mass of about 1840 electrons. It has no charge.
Both Chadwick's and Rutherford's atomic models have electrons orbiting the nucleus.
As explained in the Quarks section and in the title page of this section, Inside the Atomic Model, protons and neutrons are made up of even smaller particles.
This particle had already been theorized by Rutherford, but Chadwick showed that the neutron was not made of a proton and electron together, but rather a different particle entirely.
A neutron is slightly more massive than a proton and has the mass of about 1840 electrons. It has no charge.
Both Chadwick's and Rutherford's atomic models have electrons orbiting the nucleus.
As explained in the Quarks section and in the title page of this section, Inside the Atomic Model, protons and neutrons are made up of even smaller particles.