Drawing Lewis Structures and VSEPR A Tutorial on Writing Lewis Dot Structure.
Lewis Dot Structures - Issaquah Connect · Title: Microsoft PowerPoint - Lewis Dot Structures...
Transcript of Lewis Dot Structures - Issaquah Connect · Title: Microsoft PowerPoint - Lewis Dot Structures...
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Electron Dot StructuresLewis Dot Structure
Same, Same
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Learning Target
• Learning Target 1.3: Draw accurate models of atoms and compounds
• Learning Target 1.3b: Draw Lewis Dot Structures for atoms and compounds
• This PPT focuses on drawing Lewis Dot Structures for ATOMS• Drawing LDS for compounds comes later
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Lewis vs Bohr
• Bohr Models show the Protons, Neutrons and ALL the electrons
• Lewis structures just show the atomic symbol and VALENCE (outermost shell) electrons
Be
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Lewis vs Bohr
• Look at these Bohr models• How many VALENCE electrons does each one possess?
H
Li
Na
K
Hmmm. I thinks Isees a pattern…
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Lewis vs Bohr
• Look at these Bohr models• Every atom in Group 1 has ONE valence electron
H
Li
Na
K
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Lewis vs Bohr
• Look at these Bohr models• Every atom in Group 2 has TWO valence electrons
Be
Mg
Ca
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Lewis vs Bohr• In this “pattern”, skip over
these elements (transition metals), they behave differently
12 3 4 5 6 7
8
Group number corresponds withthe number of valance electrons
So, there’s actually a system in the organization of
the periodic table?
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Bohr Lewis
Shows protonsShows neutronsShow ALL electronsShows ALL shells
Show VALENCE electronsShows VALENCE shellsShow electrons
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Drawing Lewis Dot Structures (LDS) orElectron Dot Structures (EDS) orElectron Dot Diagram (EDD)Same, Same. Same, Same. So, this one of those “easy”
things that is actually easy? I’m skeptical…
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Practice
• Check the “Target 1.3a Practice” PPT for videos and practice