Name:
Questions: Parts of an Atom
1. Name the three particles that make up an atom.
A.
B.
C.
Fill-In-The-Blanks
1. The center of an atom is called the
.
2. In the center of an atom you will find
3. Most of the
have a mass of
and
.
of an atom is found in its nucleus because both protons and neutrons
.
4. If an atom has 7 protons and 8 neutrons, its mass number would be
5. In an atom the electrons are located in
or
.
.
6. The number of electrons an atom has is not considered when determining the mass
of that atom because electrons have a mass of
.
Complete the following chart by telling where in the atom each subatomic particle is found,
its charge and its mass.
particle
location
charge
mass
proton
neutron
electron
Completion
1. Why are atoms electrically neutral if they are made up of positively and negatively charged
particles?
2. Why does each element have a different atomic number?
3. What is an isotope?
4. Consider these two atoms
Atom #1 has 8 protons, 8 neutrons and 8 electrons Atom #2 has 8
protons, 10 neutrons and 8 electrons
Complete the following chart:
Atomic
Number
Mass Number
Atom #1
Atom #2
Are Atom #1 and Atom #2 the same element? EXPLAIN.
Charge