1. Do Now: Take out notebook and pencil
Start a new Do Now page on page 48
At top of page write Do Nows for week of 1/8
What is an atom?
What makes up an atom?

2. Quick Action – Atom INB Template
Checking for Understanding
Cut out the INB template including all solid lines.
Fold on the dotted line.
Paste the solid back into your notebook so that you have a flipable.
On the top inside part of each section draw the structure of an atom showing the charge and location of the particle.
On the bottom write notes including the charge, the location and the mass of each particle.
© KeslerScience.com

3. Protons- positively charged particle
Located inside nucleus
Atomic number = # of protons
Determines element’s identity

4. Neutrons- particles with NO charge
Located inside the nucleus
Included in the atom’s mass

5. Electrons- negatively charged particles
Located outside the nucleus in the electron cloud
So small it barely adds to the mass
Usually equal to the number of protons

6. Atoms
Periodic Table
This table shows all the different atoms there are on Earth.
It’s called the Periodic Table of Elements.
Remember, an atom is the basic unit of a chemical element.
Let’s take a closer look at one atom(element).
© KeslerScience.com

7. We can determine properties of atoms using the periodic table:
Atomic number (whole number) tells us the number of protons and electrons (always equal to the atomic number)
Atomic mass (number with decimals) helps us determine how many neutrons present
Mass – atomic number = neutrons

8. APE and MAN to determine properties of atoms

9. Quick Action – Atom INB Template
Checking for Understanding
Cut out the INB template and paste tab in notebook.
This is a way for you to remember how to calculate subatomic particles. “Ape Man”.
A = Atomic Number
P = Proton
E = Electron
All are equal is a neutral atom.
M = Mass Number
A = Atomic Number
E = Neutrons
M – A = N
© KeslerScience.com

10. Atoms
1. The element’s (atom’s) name. Nitrogen 2. The symbol for nitrogen. (N) 3. The number of protons (7), which is also referred to as the atomic number. 4. The atomic mass (14.007). (protons + neutrons = atomic mass) 5. How can we determine the number of neutrons in nitrogen? Hint: atomic mass (14) – atomic number (7)= neutrons
What can we tell about this atom (element) from the PT? N 7
14.007
Nitrogen
© KeslerScience.com

11. Quick Action – Atom Practice
Grab a partner and let’s practice. Do the math!
Element (atom)
Protons
Neutrons
Mass
Carbon ? 6 12
Beryllium 4 5 10
Magnesium 24
Make up 4 problems of your own asking for the element name, #of protons, neutrons and electrons.
© KeslerScience.com

12. Worksheet