Octet Rule and Exceptions
Chemistry ⇒ Chemical Bonding and Structure
Octet Rule and Exceptions starts at 9 and continues till grade 12.
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Describe one reason why the octet rule has exceptions.
Describe the difference between an expanded octet and an incomplete octet.
Describe why SF6 is an exception to the octet rule.
Explain why free radicals are exceptions to the octet rule.
Explain why hydrogen does not follow the octet rule.
Explain why phosphorus pentachloride (PCl5) is considered an exception to the octet rule.
Consider the molecule ClO2. Explain why this molecule is an exception to the octet rule and describe the type of exception it represents.
Given the Lewis structure of NO, explain why it does not satisfy the octet rule and how the electrons are distributed between the atoms.
Which of the following best describes a molecule with an incomplete octet?
(1) A molecule where the central atom has less than 8 electrons
(2) A molecule where the central atom has more than 8 electrons
(3) A molecule where the central atom has exactly 8 electrons
(4) A molecule with no central atom
Which of the following elements commonly does NOT obey the octet rule?
(1) Carbon
(2) Oxygen
(3) Hydrogen
(4) Neon
Which of the following elements is most likely to form compounds with an incomplete octet?
(1) Nitrogen
(2) Boron
(3) Sulfur
(4) Chlorine
Which of the following is an example of a molecule with an expanded octet?
(1) H2O
(2) PCl5
(3) NH3
(4) CO2
Fill in the blank: Elements in period ________ and beyond can have expanded octets.
Fill in the blank: The central atom in PCl5 has ________ electrons in its valence shell.
Fill in the blank: The molecule NO2 is an example of a(n) ________ exception to the octet rule.
Fill in the blank: The octet rule is based on the electron configuration of ________ gases.
True or False: All elements in the second period of the periodic table always obey the octet rule.
True or False: Boron trifluoride (BF3) is an example of a molecule with an incomplete octet.
True or False: Helium obeys the octet rule.
True or False: Oxygen can have an expanded octet in any of its compounds.
