1. Parts of the Atom
PSSA: A/S8.C.1.1

2. Objective:
TLW compare the three parts of the atom.

3. MI #1: Protons
Location – Nucleus
Charge – Positive (+)
Mass – 1 amu

4. MI #2: Neutrons
Location – Nucleus
Charge – Neutral
Mass – 1 amu

5. MI #3: Electrons Location – Electron Cloud Charge – Negative (-)
Mass amu

6. So What…? Real Life Application
Understanding the parts of the atom allows us to understand chemical bonding, chemical reactions, and nuclear reactions.

7. MI #1: Atomic Numbers
The atomic number of an atom is the number of protons in its nucleus.
All atoms of the same element have the same atomic number (hydrogen = 1, helium = 2, etc.)
Neutral atoms will have the same number of electrons as protons.

8. MI #2: Isotopes
Isotopes are atoms of the same element with different numbers of neutrons.
Isotopes have the same atomic number, but the number of neutrons differs.
Isotopes of the same element share most of the same chemical and physical properties, however, some may be unstable (radioactive) and will change (decay) over time.

9. MI #3: Mass Numbers
The mass number is the sum of the protons and the neutrons in the nucleus of an atom.
Mass Number - Atomic Number = Number of Neutrons

10. So What…? Real Life Application
Understanding atomic numbers, mass numbers, and isotopes allows us to compare elements and to understand chemical bonding, chemical reactions, and nuclear reactions.