Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do...

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Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what chapter we are on so everyone will be on the same page) History: Flashcards for definitions and identify for chapter 5.2 and 5.3, when done outline for chapter 5.4 and flashcards for 5.4. Whatever is not done is to be done as HWK.

Transcript of Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do...

Page 1: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

8th grade  Read  p.51-53  Do questions 1-2, on page 51, Do definitions p. 51 and  Do question 3 a and b p.  53 8th (please ask students what chapter we are on so everyone will be on the same page)   History:  Flashcards for definitions and identify for chapter 5.2 and 5.3, when done outline for chapter 5.4 and flashcards for 5.4.   

Whatever is not done is to be done as HWK. 

Page 2: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Where are Electrons located?

In the Electron Cloud

Page 3: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

How many Levels are in the Electron Cloud?

Three

Page 4: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

How many Electrons fit in the 1st/2nd/3rd Energy Levels?

1st Energy Level = 2 e–

2ndEnergy Level = 8 e–

3rdEnergy Level = 8 e–

Page 5: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence ElectronsThese are the electrons on the atom’s OUTERMOST or LAST Energy Level/shell

Page 6: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

1. What element is pictured?

2. How many protons?

3. How many electrons?

4. How many neutrons?

5. What is the atomic number?

6. What is the atomic mass?

7. How many valence electrons?

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Page 7: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

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Page 9: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

Valence Electrons are used to determine an element’s chemical reactivity (how easily it will react or combine or bond with other elements)

Page 10: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

ALL atoms want to have a FULL outermost shell

Atoms with a full outermost shell are the MOST stable, so they have a very low chemical reactivity.

The Noble Gases Group 18 all have a full outer shell

Page 11: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

Atoms will gain or lose electrons to get a full outer shell.

It is a lot easier to lose or gain only 1 electron, so those elements with only 1 valence electron have a very high chemical reactivity.

Page 12: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

Elements in group 1 only have 1 valence electron, so they must lose 1 electron to have a full outer shell. This makes all elements in group 1 highly reactive.

Elements in group 17 have 7 valence electron, so they must gain 1 electron to have a full outer shell. This makes all elements in group 17 highly reactive.

Page 13: Valence Electrons 8th grade Read p.51-53 Do questions 1-2, on page 51, Do definitions p. 51 and Do question 3 a and b p. 53 8th (please ask students what.

Valence Electrons

All other elements with 2, 3, 4, 5, or 6 valence electrons have a moderate chemical reactivity.

It is easier to gain/lose 2 electrons than to lose 3 electrons, so elements with 2 valence electrons are more reactive than those that must gain/lose 3 electrons.