1. Notes Chapter 5
Book chapter 4-2

2. I. Development of a Periodic Table
repeating according to some pattern.
-Mendeleev Table:
elements arranged in order of increasing atomic mass.

3. II. The Modern Periodic Table
-Table used today was created by Mosely

4. A.) New Periodic Law
*Periodic Law:
the physical and chem. properties of the elements are periodic functions of their atomic #

5. B.) Columns of the Table
*Groups:
up and down
-have similar but not identical properties

6. C.) Row of the Table
*Period:
horizontal row
-not alike in properties
-1st element is always a very reactive solid

7. -last element is always very inactive gas
-6 and 7 are rare earth elements.

8. III. Using the Periodic Table

9. A.) Metals and Nonmetals
1. Good conductors
2. Ductile
3. Malleable
-found left of the staircase line

10. *Nonmetals:
1. Poor conductors
2. Dull surfaces
3. Low melting points
-found right of the staircase line.

11. *Metalloids:
1. Shiny or dull
2. Conduct better than nonmetals.

12. 3. Include boron, silicon, germanium, arsenic, antimony, tellurium.
-found along each side of the dark staircase line.

13. IV. Periodic Properties of the Elements
-Certain properties of elements vary in a regular way from left to right across a period.(e- arrangement, reactivity, atomic size, and metallic properties

14. -valence e-:
e-’s in the outermost nrg
level
-valence #:
# of e-’s that can be
gained or lost
-oxidation #:

15. -L-R valence #’s 1, 2,3,4,3, 2,1,0
-L elements lose e- easily
-R tend to gain e- easily
-L-R atom size decreases
-L-R elements become less metallic in nature