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Presentation on theme: "Images are from www.Chem4kids.comwww.Chem4kids.com."— Presentation transcript:

1 images are from

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

3 Groups Each column is called a “group” Each element in a group has the same number of electrons in their outer orbital, also known as “shells”. Except for He, it has 2 electrons The electrons in the outer shell are called “valence electrons”

4 Transition Metals Transition Metals have slightly different rules for shells and valence electrons. This is something you will learn about in your Chemistry course later on.

5 Determine the number of shells and the number of valence electrons for:

6 Determine the number of shells and the number of valence electrons for:

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18 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.

19 The valence electrons travel further from the nucleus and have a higher energy

20 Because these electrons are further away from the nucleus, the attraction is weaker and more easily broken This is why the valence electrons determine the behavior or reactivity of an element with other elements

21 going…going…


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