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The Periodic table. Periodic Table Elements are classified by their weight and how they react.

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Presentation on theme: "The Periodic table. Periodic Table Elements are classified by their weight and how they react."— Presentation transcript:

1 The Periodic table

2 Periodic Table Elements are classified by their weight and how they react.

3 Periodic Table An element is written with information about its number of protons and neutrons. Calcium is number 20. It is written: Ca Mass number = protons + neutrons Atomic number = protons Symbol

4 Periodic Table The elements are arranged in order of mass and structure into a table known as the periodic table:

5 Periodic Table The main columns are called the groups: Group 1 Group 2 Group 3Group 4Group 5 Group 6Group 7 Group 8

6 Periodic Table The main rows are called the periods: 1 st period 2 nd period 3 rd period 4 th period 5 th period 6 th period 7 th period

7 Periodic Table The group represents the number of valence electrons Oxygen has 6 valence electrons and is in group 6 Group 6 Sodium has 1 valence electron and is in group 1 Group 1

8 Periodic Table The group represents the number of valence electrons Neon has 8 valence electrons and is in group 8 Group 8 Tin has 4 valence electrons and is in group 4 Group 4

9 Periodic Table The periods represents the number of electron shells Oxygen has 2 electron shells and is in the 2 nd period 2 nd period Sodium has 3 electron shells and is in the 3 rd period 3 rd period

10 Periodic Table The group represents the number of valence electrons Neon has 2 electron shells and is in the 2 nd period 2 nd period Tin has 5 electron shells and is in the 5 th period 5 th period


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