Atoms are made of protons, neutrons and electrons.
Protons have a positive charge and are abbreviated P+.
They are located in the nucleus.
Electrons have a negative charge and are abbreviated
E-. They are outside the nucleus.
Neutrons are neutral (having no charge) and are
abbreviated N°. They are located in the nucleus.
The number of protons in an atom equals the atomic
number of that atom.
The number of protons in an atom equals the number
of electrons in that atom. (for neutral atoms)
The number of protons plus the number of neutrons
equals the mass number (rounded) or atomic mass (not
rounded).
The electrons are located on electron shells outside
the nucleus.
Each electron shell can hold only a certain number of
electrons. Once one shell is full, the electrons begin to
occupy the next shell.
The first shell holds only 2 electrons.
The second shell holds 8 electrons.
The third shell holds 18 electrons.
The fourth shell holds 32 electrons.
There are a total of seven shells. You are responsible
for knowing the number of electrons that fit in the first
four shells.
Directions
Using the above background information and the
clues given below, construct the models of the
following atoms. You must include the correct
number of protons, neutrons and electrons. Each
of the parts of the atom must be in the correct
spot. You must have the electrons occupying the
correct shell. Your teacher will show the correct
model once everyone has completed each model
with his/her partner. Write in the correct
number in each blank as we go.
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons
Protons
Neutrons
Electrons