1. Patterns & the Periodic Table
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2. Learning goals
We are learning to identify groups and patterns in the periodic table.
We are learning to identify parts of the atom.
We are learning to determine number of protons, electrons and neutrons in an atom.

3. What is the Periodic Table?
A collection of all known elements on earth.
Element: A pure substance that cannot be broken down.

4. Organization of Periodic Table
Groups: The vertical columns of a periodic table.
Periods: The horizontal rows of a periodic table.
Periodic tables show the location of:
Metals
Non-Metals
Metalloids (staircase line)

5. Metals (Blue) Metalloids (yellow) Non-Metals (pink) Staircase Line 1 23 4 5 6
Non-Metals (pink)
Staircase Line

6. Special Groups Alkali Metals (Group I): Soft highly reactive metals.
Alkaline Earth Metals (Group II): Soft, silvery and reactive metals.
Halogens (Group XVII): One of the most reactive groups on periodic table.
Noble / Inert Gases (Group XVIII): Very stable, rarely react with other chemicals.

7. Atomic Structure In each atom there are three subatomic particles:
Location
Charge
Symbol
Proton
Inside the nucleus +1 p+
Electron
Outside the nucleus -1 e-
Neutron n0

8. Atomic number tells you the number of protons
determines what the atom is
tells you the number of electrons

9. Example: Oxygen element name atomic number element symbol
# of protons = 8
# of electrons = 8
charge =

10. Mass number Sum of protons and neutrons
# neutrons = mass number (rounded) – atomic number

11. Example: Oxygen element name atomic number element symbol atomic mass
# of protons = 8
# of neutrons =
atomic mass – atomic #
# of electrons =
#n = 16 – 8
#n = 8 8
charge =

12. Learning goals
We are learning to identify groups and patterns in the periodic table.
We are learning to identify parts of the atom.
We are learning to determine number of protons, electrons and neutrons in an atom.