1. Let’s Preview the STRUCTURE OF AN ATOM

2. Copy the next page in your science notebook.
Leave several blank lines in between each term.
Fill in the blank lines with information from this PowerPoint.

3. The Parts of an Atom Nucleus Proton Neutron Electron Valence electron
Shells
Nuclear Force

4. WHAT IS THE NUCLEUS? The central (middle) part of an atom.
Composed of protons and neutrons.
Contains most of an atom's mass. Why?

5. WHAT IS A PROTON? Positively charged particle.
Found within an atomic nucleus.
Same as the ATOMIC NUMBER

6. WHAT IS A NEUTRON? Uncharged (neutral) particle.
Found within an atomic nucleus.

7. WHAT IS AN ELECTRON? Negatively charged particle.
Located in shells that surround an atom's nucleus.
Much, much smaller than protons and neutrons

8. What is the Shell? Also known as energy levels and the electron cloud.
- Where the electrons are located.
Also known as energy levels and the electron cloud.
The PERIODS on the Table of Elements tells you how many shells an atom has.

9. Valence Electron Only the electrons in the OUTER SHELL
Valence electrons are what bond with other atoms
The GROUPS on the periodic table tell you how many valence electrons they have. Ex: If they are in group 1, they have 1 valence electron.

10. Ticket Out the Door Put away your notebooks.
Make sure you label your paper with your name, date, and block.
Keep answers covered. Do NOT share with your neighbors.

11. Extra Activity
Now let’s draw an atom for the element Neon.

12. Now let’s draw an atom for the element Neon.
1. Draw the number of protons
2. Draw the first shell. How many electrons can you put on the first shell? Draw them (remember that they are smaller than protons).
3. Draw 2nd shell. How many electrons do you have left and how many can go on the 2nd shell? Draw them.
4. Solve for neutrons. (Remember the word “MAN” Mass - Atomic number = Neutrons. Draw them.
Label the protons, neutrons, nucleus, electrons, valence electrons, and the electron cloud.
Now let’s draw an atom for the element Neon.

13. Check Your Work
valence
Electron
Cloud
Nucleus