1. Calculating the number of Protons, Neutrons, and Electrons.
Using the atomic number and the mass number of an element square.

2. The Atom Is about….. Anything that has matter/mass or takes up space.
Made up of three subatomic particles (protons, neutrons, and electrons)

3. Atomic Number Number of protons
Used to determine what kind of element/atom you have.
Always a whole number
Also, tells us the number of electrons in a neutral atom.

4. Mass Number Equal to the number of protons + neutrons
Equals the mass of the nucleus
Decimal number
Round to a whole number to use

5. Atomic Mass Average mass of all the isotopes for a certain atom.
Same as the mass number (for this year)
Mass can change because we can add or remove neutrons.
Use the mass – atomic number to solve for neutrons.

6. 8 O Oxygen 15.999 Element Square Key Atomic Number Symbol
Name of Element
Atomic Mass
Mass Number
Atomic Weight
Atomic Number = Protons and Electron
Calculate Neutrons = Rounded Atomic Mass – Atomic Number
EXAMPLE: rounds to 16 so
16 – 8 = 8
Oxygen has 8 neutrons!

7. #1
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass B

8. #2
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass 11

9. #3
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass 31

10. #4 31 37 Hint = Isotope Think about what number will be different
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass 31 37
Hint = Isotope
Think about what number will be different

11. #5
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass 89

12. #6
Symbol
Atomic Number
Protons
Neutrons
Electrons
Atomic Mass
207

13. More Practice Complete the chart
When complete you may color code the atoms on the back