The Periodic Table Part I.

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Presentation transcript:

The Periodic Table Part I

Periodic - Items are arranged in a regular, repeating pattern.

A. Dmitri Mendeleev (1834-1907) Arranged elements by atomic mass. Looked for patterns among properties of the different elements. Li Be B C N O F Ne Na Mg Al 3) Left gaps in the table where there were elements yet to be discovered. (Ga, Sc)

B. Henry Moseley (1887-1915) * Continued Mendeleev’s work, but arranged elements by atomic number, instead of atomic mass.

II. Parts of the Periodic Table Groups Vertical columns on the periodic table. There are 18 groups called families because they share similar properties (Number them on your PT)

II. Parts of the Periodic Table B. Periods 1) Horizontal rows on the periodic table 2) There are 7 periods (number them on your PT)