The Key to ChemistryThe Key to Chemistry

Prepared by:

Mayleen Piolo-Malagamba

MSU Wao

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Objectives:

• Students will learn the history of the early attempts in the classification of the elements.

• Students will know the scientists involved in the arrangement of elements in the periodic table.

• Students will identify the parts/features of the periodic table.

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Just a check. . .

Group the pictures into your preferred category

example: things I like, things I do not likeWrite your answer on a piece of paper. You are given 15 minutes only to do the activity.

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Where Do I Belong?

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The Evolution of the Periodic Table17891789

18081808

18641864

19131913

1863186318291829

18281828

1894189418691869 18691869

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Antoine Lavoisier

wrote the first extensive list of elements containing 33 elements

distinguished between metals and nonmetals

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John Dalton

set up a table of elements according to their relative atomic weights

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Jacob Berzelius

developed a table of atomic weights

introduced letters to symbolize elements

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Johann W. Dobereiner

classified the existing elements into group of three’s - TRIADS

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De Chancourtois

grouped the elements in a spiral order divided by a vertical line based on increasing atomic weights

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John Newlands

arranged the known elements in order of atomic weights and observed

similarities between the first and ninth elements, the second and tenth elements etc.

proposed the 'Law of Octaves'

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Lothar Meyer

compiled a Periodic Table of 56 elements based on the periodicity of properties such as molar volume when arranged in order of atomic weight.

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Dmitri Mendeleev

arranged the elements in the order of increasing atomic mass (Periodic Table)

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discovered the Noble Gases.

William Ramsay

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Henry MoselyHenry MoselyHenry Mosely

determined the atomic number of each of the elements.

modified the 'Periodic Law' to read that the properties of the elements vary periodically with their atomic numbers.

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<<<Click me to view the periodic table

Click me to view the features of the periodic table >>>

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AssignmentUse the periodic table to identify each of the following sets of elements as part of a group or a period of elements. If the set does not represent a group or a period, write none.

a. C, Si, Geb. Li, Be, Bc. P, As, Sbd. O, S, See. Ag, Cd, Sn

References:

Phoenix (You and the Natural World Series) Chemistry; Mendoza and ReligiosoDIWA Companion cd (Science)www.wikepedia.orgwww.elementsdatabase.comwww.ausetube.com