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Periods Each row is called a “period” The elements in each period have the same number of shells www.chem4kids.com.

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Presentation on theme: "Periods Each row is called a “period” The elements in each period have the same number of shells www.chem4kids.com."— Presentation transcript:

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2 Periods Each row is called a “period” The elements in each period have the same number of shells www.chem4kids.com

3 Groups Each column is called a “group” Except for He, it has 2 electrons The electrons in the outer shell are called VALENCE ELECTRONS All elements in that group/family have “same” number of VALENCE ELECTRONS www.chem4kids.com

4 Transition Metals Transition Metals have slightly different rules for shells and valence electrons. This is something you will learn about in High School Chemistry. www.chem4kids.com

5 Determine the number of shells and the number of valence electrons for: www.chem4kids.com

6 Determine the number of shells and the number of valence electrons for: www.chem4kids.com

7 TIME TO PRACTICE

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19 Helium is the exception in Group 8. Since it has just one shell, that shell can only fit 2 electrons instead of 8. It is in this group because all the elements have a full outer shell.

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