1. Earth Science Notes
The Periodic Table

2. Objectives I can… Retell the development of the periodic table
Explain the organization of the Periodic Table
Distinguish metal elements from nonmetal elements

3. The Periodic Table
Question: What is the purpose for the periodic table?
Answer: Putting elements into a certain order allows us to remember their characteristics and predict their behavior better.

4. Medeleev’s Periodic Table
Dmitri Mendeleev: first to classify elements in a logical and systematic way.
Mendeleev was a Russian chemist (1834 – 1907)
He put elements in order of increasing mass
He predicted the physical and chemical properties of undiscovered elements.

5. Medeleev’s Periodic Table
Notice: Mendeleev predicted the masses and properties of unknown substances.

6. Medeleev’s Periodic Table
There was a problem with Medeleev’s Table
No noble gasses
Te and I did not match the properties of their respective columns

7. The Periodic Table
Henry Moseley: first to determine the atomic number of atoms
Moseley was a British physicist ( )
He rearranged the periodic table into elements according to increasing atomic number
This fixed the problem with Tellurium and Iodine

8. Reading The Periodic Table
Periods – the horizontal rows
Move from left to right with increasing atomic number.
Periodic Law: when elements are arranged according to increasing atomic number their is a periodic repetition of their properties

9. Reading The Periodic Table
Groups – the columns
Also called family
A number and a letter identify each group.
EX: IA , IIA, IIIA, IVA, ect.

10. Reading The Periodic Table
Each group of elements have similar properties
Group 1A – contains H, Li, Na, etc.
AKA alkali metals
Has one electron in outer energy level
Properties
Conduct electricity well, ductile, have luster, malleable, react violently with water

11. Reading The Periodic Table
Each group of elements have similar properties
Group 2A – contains Be, Mg, Ca, Sr, etc.
AKA alkali earth metals
Has two electrons on outer energy level
Group 3A – boron
Has three electrons in outer energy level

12. Reading The Periodic Table
Each group of elements have similar properties
Group 4A – carbon family
Has four electrons in outer energy level
Group 5A – nitrogen family
Has five electrons in outer energy level
Group 6A – oxygen family
Has six electrons in outer energy level

13. Reading The Periodic Table
Each group of elements have similar properties
Group 7A – halogens
Has seven electrons in outer energy level
Group 8A – noble gases
Has eight electrons in outer energy level

14. Reading The Periodic Table
Group B elements
Transition elements – elements like copper, gold, silver.
Lanthanide and Actinide Series – made up of rare earth elements
Includes uranium

15. Reading The Periodic Table
Elements on the PT can be classified as:
Metals
Groups 1A, 2A, Group B, and post Transition Metals
Metalloids
Elements that touch the dark stepped line
Nonmetals
To the right of the metalloids

18. Summary Be able to… Retell the development of the periodic table
Explain the organization of the Periodic Table
Distinguish metal elements from nonmetal elements