1. History of the Periodic Table Notes

2. 1. During the nineteenth century, how did the chemists began to categorize the elements on the periodic table? What was the end result of this method?
The chemists began to categorize the elements according to similarities in their physical and chemical properties.
The end result of this method was our modern periodic table we use today 

3. WHO: Johann Dobereiner Law of Triads 1780 - 1849 WHEN: WHAT: WHY:
Example:
Law of Triads
1829
Classified some elements into groups of three called triads.
Based the triads on similarities between chemical and physical properties of the elements

4. Law of Octaves WHO: John Newlands WHEN: WHAT: 1838 - 1898 WHY:
Example:
John Newlands
1863
Arranged the elements in order of increasing atomic mass
Law of
Octaves
Certain properties repeated every 8th element

5. WHO: Dmitri Mendeleev Modern Periodic Table 1834 - 1907 WHEN: 1869
WHAT:
EXAMPLE:
Dmitri Mendeleev
1869
Modern Periodic Table
Organized periodic table by increasing atomic mass

6. Published own periodic table based on increasing atomic mass
WHO:
WHEN:
WHAT:
Published own periodic table based on increasing atomic mass
Lothar Meyer
1869 ( a couple months after Mendeleev)
Published his own table of elements organized by increasing atomic mass

7. Elements known at this time
Both Mendeleev and Meyer arranged the elements in order of increasing atomic mass.
Both left vacant spaces where unknown elements should fit.

8. Mendeleev wins the title because...
He corrected the atomic masses of Be, In, and U
He used his periodic table to predict the physical properties of three elements that were yet unknown.

9. Increasing atomic number
WHO:
WHEN:
WHAT:
Henry Moseley
Increasing atomic number
1913
Determined the nuclear charge (atomic number) of the elements
Rearranged the elements in order of increasing atomic number

10. Periodic Law
When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.

11. The horizontal rows of the periodic table are called PERIODS.

12. The vertical columns are called GROUPS, or FAMILIES.
The elements in the same group have similar physical and chemical properties!

13. Periodic Table Geography Fill out the following on your Periodic Table!

14. Metals vs. Nonmetals
Outline the metals red.

15. metals

16. Metals vs. Nonmetals Outline the metals red.
Outline the nonmetals blue.

17. metals
nonmetals

18. Metals vs. Nonmetals Metalloids Outline the metals red.
Outline the nonmetals blue.
Outline the metalloids green
Metalloids

19. metals
nonmetals
metalloids

20. Metals and nonmetals can be split into 5 subgroups
Alkai Metals
Alkaline Earth Metals
Transition Metals
Halogens
Nobel Gases

21. Group 1: Alkali Metals

22. Group 2: Alkaline Earth Metals

23. Groups 3-12: Transition Metals

24. Group 17 (7A): Halogens

25. Group 18 (8A): Noble Gases

26. Valence Electrons