1. Chapter 4 ATOMS 3. Periodic Table
A. History of the Periodic Table
Mendeleev
Mosely

2. Mendeleev Mendeleev (1869, Russian)
Organized elements by increasing atomic mass.
Predicted the existence of undiscovered elements
PROBLEMS 

3. Henry Mosely Henry Mosely (1913, British)
Organized elements by increasing atomic number.
Fixed problems in Mendeleev’s arrangement. 

4. Metallic Character Rows & Columns Table Sections
B. Organization
Metallic Character
Rows & Columns
Table Sections

5. Metallic Character
Metals
Nonmetals
Metalloids

6. Table Sections Representative Elements Transition Metals
Inner Transition Metals

7. Table Sections Overall Configuration Lanthanides - part of period 6
Actinides - part of period 7

8. Columns & Rows
Group (Family)
Period

9. C. Periodic Trends
Terms
Periodic Trends

10. Terms
Periodic Law
Properties of elements repeat periodically when the elements are arranged by increasing atomic number.

11. Terms Valence Electrons e- in the outermost energy level Atomic Radius
First Ionization Energy
energy required to remove an e- from a neutral atom

12. Periodic Trends
Atomic Radius
Increases to the LEFT and DOWN.

13. Periodic Trends
First Ionization Energy
Increases to the RIGHT and UP.

14. Be or Ba Ca or Br Ba Ca B. Periodic Trends
Which atom has the larger radius?
Be or Ba
Ca or Br Ba Ca

15. N or Bi Ba or Ne N Ne B. Periodic Trends
Which atom has the higher 1st I.E.?
N or Bi
Ba or Ne N Ne