1. Chapter 6.1, 6.2 Navigating the Periodic Table

2. Warm-up Circle the element with the 1. Smaller radius
Cu or Au b) N or Si c) Ar or Na
Higher charge effect
Kr or Br b) B or F c) K or Kr
3. Higher shield effect
a) P or As c) Mg or Sr c) H or Rb

3. Warm-up: Atomic size Go to your lab group and get the white board
As a group come up with 4 (5) observations about the size of elements in the PT
Each person in your group writes one observation (different handwriting)

4. History of the Periodic Table
1700 only 13 elements were known
First PT sorted by Atomic Mass
Dimitri Mendeleev

5. Periodic Law: Repeating groups
PT is sorted by increasing AN
Groups (columns) A
have the same # Valence e- H 2A
group # = # Ve Li Be
Ex: 2A = 2 Ve Na Mg 3B 4B
same properties and Rx K Ca Sc Ti

6. A Group and B-Group Elements
Representative Elements Transition Elements
Groups 1A – 8A Groups 1B-8B
Group # = # Ve- Group # is not # Ve!
s and p block elements d, f block elements
(multiple e-config.)

7. C. Substance Groups Metals 80% of all elements
Good conductors of heat and electricity.
High luster (sheen) when clean or new
Solids at room temperature (except mercury)
Malleable (bendable)

8. Nonmetals Most are gases; or brittle solids
Poor conductors of heat and electricity
Good insulators

9. Metalloids boundary between metals and nonmetals.
Properties similar to both classes
Semiconductors
B, Si, Ge, At, As, Sb, Te,

10. Alkaline Metals Group # 1A (w/o Hydrogen!) Valence e- orbital: xs1
# of V e-: 1
explosive
soft
Components of many salts

11. Earth Alkaline Metals
Group # 2A Valence e- orbital: xs2 # of Ve-: 2 Less soft and less explosive than alkaline m.

12. Halogens Group # 7A Valence e- orbital: xs2 xp5
# of Ve-: 7 (s2 + p5= 7)
Corrosive, aggressive, toxic gases

13. Noble Gases Group # 8A Valence e- orbital: xs2 xp6
Valence e-: s2 + p6 = 8Ve-
Inert gases: means that they don’t react, also called protective gases

14. Lanthanides and Actinides f-block
very large elements
many radioactive
some do not naturally exist

16. Warm-up Silicon-30 #p+ 8. # Ve- # no 9. Ve- orbital
# e Aufbau Diagram
AN Bohr’s Model
MN Orbital Model
Long e-conf period
[NG] e-conf group
15. substance class

17. Journal: Identify the following elements
Group 2A, Period 3
Group 3A, Period 3
Group 2B, Period 5
Group 1A, Period 1
Group 7A, Period 2
Group 8A, Period 6

18. 2 Demos Brain storm
Both elements Mg and Na showed classical chemical reactions. On your white board
List the visual characteristics
Try to write a reaction