OBJ 4.7-4.9 Valence Electrons & Dot Diagrams
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Chemistry
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8th - 10th Grade
•
Easy
Standards-aligned
Kristen Kush
Used 42+ times
FREE Resource
14 Slides • 12 Questions
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OBJ 4.7-4.9 Valence Electrons & Dot Diagrams
If you answer all the Qs and earn at least a 70% then you'll get a full 10/10. It's better to guess than skip
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Poll
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Multiple Choice
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Using Bohr Notation
The last number represents the number of valence electrons
An atom can have 1-8 Valence electrons (for now)
Example: Nitrogen 2-5
How many valence elctrons?
5!
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Multiple Choice
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Multiple Choice
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Open Ended
What pattern did you notice?
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Recognizing Patterns
How do we determine the number of valence electrons in a neutral atom?
For all elements located in the “A” groups:
The number in front of the A is equal to the number of valence electrons.
the group “A” number = # of valence e-
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Nitrogen
5 valence electrons = 5 dots
4 locations for electrons
Fill the "empty" space first, then pair up after
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Multiple Choice
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Helium: the "exception"
How many total electrons does helium have?
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Open Ended
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Helium
Helium has 2 electrons. So it only has 2 valence electrons.
Elements in group 8A have full orbitals / shells
All other elements in group 8A are said to have an "octet" 8 electrons
Think: 2s2 + 2p6 = 8 electrons
There is only one orbital in the first energy level (1s)
Helium is called a "duet"
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Poll
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Open Ended
OBJ 4.7-4.9 Valence Electrons & Dot Diagrams
If you answer all the Qs and earn at least a 70% then you'll get a full 10/10. It's better to guess than skip
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