Flashcards
Lewis Structure Shape and Polarity
Cards in this deck (10)
- 1How to draw a Lewis Structure1. Count the number of valence electrons
2. Put the most electron needing atom in the centre
3. Use single bonds to connect the remaining atoms to the central atom.
4. Distribute (in pairs) the remaining electrons around the atoms.
5. If an - 2Level 2 exceptions to the octet ruleIn a Lewis Structure all atoms require 8 electrons except
H, He and Li = 2
Be = 4
B = 6 - 3Shape is determined bythe number of negative regions / electron clouds surrounding the central atom
AND
how many of those regions are bonded - 4If the central atom is surrounded by four negative regions/electron clouds, the electrons involved repel each other to a ...tetrahedral arrangement
- 5If the central atom is surrounded by three negative regions/electron clouds, the electrons involved repel each other to a ...triangular planar arrangement
- 6If the central atom is surrounded by two negative regions/electron clouds, the electrons involved repel each other to a ...linear arrangement
- 7This shape is called... The bond angle is ...tetrahedral with a bond angle of 109
- 8When does this shape form?When there are three negative regions surrounding the central atom
and all three regions are involved in bonding
- 9What shapes arise from a tetrahedral arrangement of negative regions?
- 10What is the shape of a molecule with 3 electron clouds one of which is not involved in bonding?Bent or v-shaped with a bond angle of approx 120
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- High School Level 2 Chemistry Flashcards on Lewis Structure Shape and Polarity, created by Tanya Haywood on 24/09/2015.
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- Tanya Haywood
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