1. Periodic Table Notes

2. What is an atom?
A very small particle that makes up most kinds of matter
Made up of smaller parts called subatomic particles: protons, neutrons, and electrons
Protons: positive charge [+]
Neutrons: no charge (or “neutral”) [0]
Electrons: negative charge [-]
“atom” means “cannot be divided”
1,000,000 lined up= thickness of a human hair!

3. Even though atoms are very small…
They do have mass- most is found in the nucleus
Nucleus= protons and neutrons inside
Electrons= orbit around the nucleus at great speeds; have almost no mass
# Protons= # Electrons
Atomic number= # protons

4. Periodic Table Organization
Element Name
Atomic Number
(# of protons/ electrons)
Element Symbol
Atomic Mass
(protons + neutrons)

5. Periodic Table Organization
Family/ Groups = Columns
Period = Rows

6. Family/ Groups
All elements in the same family/column have the same number of valence electrons (number of electrons on the outside shell).

7. Periods
All elements in the same period/row have the same number of electron shells.

8. Metals (shaded yellow)
The periodic table is made up of mainly metals.
Transition Metals (outlined in red) do not follow the same “rules” so we do not consider them in this class.

9. Coloring the Periodic Table
Color code your periodic table:
Metals = yellow
Metalloids = green
Gas = blue