Guided Reading Chapter 14 Section 1
1. Atoms are made of three basic components. Name these three particles.
2. One of two forces that hold atoms together is called _____________ ______________.
3. A particle with a negative charge was discovered by English physicist,
__________________, and is called the __________________.
4. Several scientists, including Ernest Rutherford, performed an experiment that helped
improve the model of atom by realizing the inner core of the atom housed most of the
mass. This core has a special name, the _____________.
a) electron b) nucleus c) proton
5. The two particles that make up most of the mass of the atom are called the
_____________ and the ________________.
a) proton, electron b) neutron, electron c) proton, neutron
6. Which particle occupies the space outside the nucleus, in a “cloud?”
7. Complete the following table, comparing forces within atoms.
Electromagnetic force
Compared to our
solar system – planets
don’t fall into the Sun
Attractive force
between the proton
and the neutron
Strongest force
known to science
Weak force
A force that is
significant when
atoms break apart.
The weakest force An unsolved mystery
in science
