1. Chemical Periodicity
Chapter 14

2. History of the Periodic Table
Mendeleev (1860’s)
Developed the first periodic table
It was arranged by atomic mass
He was able to predict properties of elements

3. History of the Periodic Table (cont.)
Moseley – developed the modern periodic table

4. Characteristics of Metals
Hard
Shiny
Conduct heat and electricity well
Includes the transition and inner-transition metals
Inner transition metals include the lanthanoids and actinoids

5. Characteristics of Nonmetals
Are gases or brittle solids at room temp.
Surfaces are dull
Insulators

6. Characteristics of Metalloids
Have properties of both metals and nonmetals

7. I. Periodic Table Revisited
Groups or Families (terms synonymous)
vertical columns
have similar chemical & physical properties
B. Periods
Horizontal rows
Energies of outermost electrons are similar

8. Period vs. Group Period All elements in a horizontal row
7 periods on the periodic table

9. Group
All elements in a vertical column
Sometimes called “families”

10. Group 1 (IA) – Alkali Metals

11. Group 2 (IIA) – Alkaline Earth Metals

12. Group 17 (VIIA) - Halogens

13. Group 18 (VIIIA) – Noble Gases

14. II. Organization (your Roadmap)
A. Metals-
Nonmetals-
Metalloids-
Left of zig zag
Right of zig zag
On the zig zag
NONMETALS
METALLOIDS
METALS

15. REPRESENTATIVE “Group A”
C. Group A & B
Group A- Representative
Group B - Transition
REPRESENTATIVE “Group A”
TRANSITION “Group B”
INNER TRANSITION