Atomic Structure: TEKS 8.5A
To the teacher:
• This CPO Science PowerPoint presentation is designed to guide you
through the process of presenting the lesson to your students. The
presentation uses a 5-E teaching model: Engage, Explore, Explain,
Elaborate, and Evaluate.
• The PowerPoint Slide notes indicate where you may want to bring in
various lesson elements such as quizzes, readings, investigations,
animations, and practice materials. Additional science background
information is provided in the slide notes where appropriate. You
can view these notes by selecting “View,” then “Normal.” You will
see the notes pane at the bottom of the PowerPoint workspace.
Additionally, the slide notes are available as a separate document,
accessible from the lesson home page.
• The slides that follow are intended for classroom use.
Atomic Structure: TEKS 8.5A
What is inside an atom?
• If you crush wintergreen candy with
your teeth, blue sparks jump out of
your mouth! You can see the effect
even better if you crush one of the
candies with a pair of pliers in a dark
room.
• In order to understand why the sparks
appear, you must know what is inside
an atom. After completing this
module, do an internet search on
triboluminescence to find out why the
candy sparks when you crush it.
Atomic Structure: TEKS 8.5A
Time to investigate!
• Complete the lesson investigation: Building the Elements
Atomic Structure: TEKS 8.5A
Three particles make up all atoms.
• Protons have positive (+1) charge. They are found in
the nucleus of every atom.
• Neutrons have zero charge. They are also found in the
nucleus of every atom except hydrogen.
• Electrons have negative (-1) charge. They are found in
an area outside the nucleus known as the electron
cloud.
Atomic Structure: TEKS 8.5A
The size and structure of an atom
• The overall size of an atom is
the size of its electron cloud.
• If an atom were the size of a
football stadium, the
nucleus would be the size of
a pea, and the electron
cloud would be like a small
swarm of gnats buzzing
around the stadium at high
speed.
Atomic Structure: TEKS 8.5A
Where is most of an atom’s mass?
• A proton has 1,836 times
as much mass as an
electron.
• A neutron has about the
same mass as a proton.
• More than 99% of an
atom’s mass is in the
nucleus.
Atomic Structure: TEKS 8.5A
Summary: the structure of an atom
Atomic Structure: TEKS 8.5A
Time for Practice!
• Complete the lesson practice activity:
– Structure of the atom
You will need to know what these
words mean:
atomic number
mass number
isotope
Review your student reading for help!
Atomic Structure: TEKS 8.5A
Show what you know!
• Try the lesson’s interactive
quiz, or complete a quiz that
your teacher can print out
for you.
• Hint: You might want to
review your lesson reading
piece one more time before
trying the quiz.