In Rutherford’s nuclear model of
the atom, the entire positive charge and
most of the mass of the atom are
concentrated in the nucleus with the
electrons some distance away The
electrons would be moving in orbits
about the nucleus just as the planets
do around the sun Rutherford’s
experiments suggested the size of
the nucleus to be about 10–15 m to
10–14 m From kinetic theory, the size
of an atom was known to be 10–10 m,
about 10,000 to 100,000 times larger
than the size of the nucleus (see Chapter 10, Section 10