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Questions and Answers
What is the Lewis dot formula for CO2?
What is the Lewis dot formula for CO2?
- :O:C:O:
- :O:C:O:
- :O:C::O: (correct)
- :O::C::O:
Why does NaCl not conduct electricity in the solid state?
Why does NaCl not conduct electricity in the solid state?
- The crystalline structure does not have ions
- None of these
- The ions of NaCl become mobile only in the molten state and are not free to move in the solid state (correct)
- When a bond is formed between ions they lose their charges
Which of the following species exhibits a bond that is nondirectional?
Which of the following species exhibits a bond that is nondirectional?
- NCl3
- RbCl (correct)
- BeCl2
- BCl3
Which of the following is an exception to the octet rule?
Which of the following is an exception to the octet rule?
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According to Fajans rule, which combination favors a covalent bond?
According to Fajans rule, which combination favors a covalent bond?
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What type of bond involves the equal sharing of electrons between two atoms?
What type of bond involves the equal sharing of electrons between two atoms?
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In an ionic compound, which factor leads to the greatest degree of covalent bonding?
In an ionic compound, which factor leads to the greatest degree of covalent bonding?
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What causes the distortion of the shape of an anion in polarisation?
What causes the distortion of the shape of an anion in polarisation?
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Study Notes
Lewis Dot Formula
- The Lewis dot formula for CO2 is :O=C=O:
Conductivity of NaCl
- NaCl (sodium chloride) does not conduct electricity in the solid state because the ions are rigidly held in place and are not free to move.
Nondirectional Bonds
- The hydrogen atom exhibits a nondirectional bond because its single electron is in the 1s orbital, which is spherical in shape.
Exceptions to the Octet Rule
- Nitrogen (NF3) is an exception to the octet rule because it has a valence shell that is not filled.
Fajans Rule
- According to Fajans' rule, a high positive charge on the cation and a high polarizability of the anion favor a covalent bond.
Covalent Bonds
- A covalent bond involves the equal sharing of electrons between two atoms, typically between two non-metal atoms.
Ionic Compounds
- In an ionic compound, the factor that leads to the greatest degree of covalent bonding is high charge density on the cation.
Polarisation
- The distortion of the shape of an anion in polarisation is caused by the presence of a high-charge-density cation, which pulls the electron cloud towards it.
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