Octet Rule and Exceptions
Chemistry ⇒ Chemical Bonding and Structure
Octet Rule and Exceptions starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Octet Rule and Exceptions.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 9
Describe the difference between an incomplete octet and an expanded octet.
Describe what is meant by an 'expanded octet'.
Describe why beryllium chloride (BeCl₂) is considered an exception to the octet rule.
Describe why some molecules have an odd number of electrons and cannot satisfy the octet rule.
Explain why hydrogen does not follow the octet rule.
Explain why NO₂ is an exception to the octet rule.
Explain why phosphorus pentachloride (PCl₅) is an exception to the octet rule.
Consider the molecule ClO2. Explain why this molecule is considered an exception to the octet rule and describe the type of exception it represents.
Which of the following elements can have an expanded octet?
(1) Nitrogen
(2) Oxygen
(3) Sulfur
(4) Fluorine
Which of the following elements is least likely to form an expanded octet?
(1) Phosphorus
(2) Sulfur
(3) Carbon
(4) Xenon
Which of the following elements is most likely to follow the octet rule when forming compounds?
(1) Neon
(2) Sodium
(3) Carbon
(4) Hydrogen
Which of the following elements is most likely to form an incomplete octet?
(1) Boron
(2) Oxygen
(3) Chlorine
(4) Neon
Fill in the blank: ______ (element) is an example of an element that can have an expanded octet.
Fill in the blank: ______ (element) is an example of an element that can have an incomplete octet in its compounds.
Fill in the blank: Atoms that have less than eight electrons in their valence shell are called ______ octet exceptions.
Fill in the blank: Elements in period 2 cannot have an ______ octet.
True or False: All elements always obey the octet rule when forming chemical bonds.
True or False: All noble gases have a complete octet in their natural state.
True or False: Boron trifluoride (BF₃) is stable even though boron has only six electrons in its valence shell.
True or False: Helium follows the octet rule.
