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The Periodic Table. Dimitri Mendeleev Father of the Periodic Table Father of the Periodic Table Looked for clues (studied the evidence) Looked for clues.

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Presentation on theme: "The Periodic Table. Dimitri Mendeleev Father of the Periodic Table Father of the Periodic Table Looked for clues (studied the evidence) Looked for clues."— Presentation transcript:

1 The Periodic Table

2 Dimitri Mendeleev Father of the Periodic Table Father of the Periodic Table Looked for clues (studied the evidence) Looked for clues (studied the evidence) Wrote facts on paper cards Wrote facts on paper cards Observed patterns Observed patterns

3 Observations: Melting point Melting point Density Density Color Color Atomic mass (as compared to hydrogen) Atomic mass (as compared to hydrogen) Bonding power (how many bonds each element formed with oxygen) Bonding power (how many bonds each element formed with oxygen)

4 Copper and Silver are both shinny, tarnish and turn green Chlorine and Fluorine are both gases and can irritate your lungs

5 Mendeleevs Observations Patterns appear when elements are arranged in order of increasing atomic mass Patterns appear when elements are arranged in order of increasing atomic mass Grouped cards according to patterns Grouped cards according to patterns Published first Periodic Table in 1869 Published first Periodic Table in 1869

6 First Periodic Table

7 The Periodic Table Today Arranged by atomic number Arranged by atomic number Over 100 known elements today Over 100 known elements today Some elements have not been discovered yet – spaces on the Periodic Table have been left for them Some elements have not been discovered yet – spaces on the Periodic Table have been left for them

8 Groups and Periods 18 vertical columns called GROUPS or FAMILIES 18 vertical columns called GROUPS or FAMILIES Elements in each group have similar characteristics Elements in each group have similar characteristics Group 1 are the alkali metals – react violently with waterGroup 1 are the alkali metals – react violently with water Group 18 are the Noble Gases – rarely react at allGroup 18 are the Noble Gases – rarely react at all 7 horizontal rows called PERIODS 7 horizontal rows called PERIODS Series of different elements that are not alike Series of different elements that are not alike Pattern: reactive to non-reactivePattern: reactive to non-reactive

9 What causes bonding power? Valence electrons Valence electrons The elements in each group of the periodic table have the same number and arrangement of valence electrons The elements in each group of the periodic table have the same number and arrangement of valence electrons

10 Valence Electrons Group 1 Alkali Metals Group 18 Noble Gases


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