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 the difference between an expanded octet and an incomplete octet.
Describe the three main types of exceptions to the octet rule, giving an example for each.
Describe why NO2 is considered an exception to the octet rule.
Explain why BF3 is considered an exception to the octet rule.
Which of the following elements commonly forms compounds that do NOT obey the octet rule?
(1) Carbon
(2) Nitrogen
(3) Boron
(4) Neon
Which of the following is a molecule with an expanded octet?
(1) BCl3
(2) SF4
(3) H2O
(4) NH3
Which of the following is NOT a reason for exceptions to the octet rule?
(1) Odd number of electrons
(2) Expanded valence shell
(3) Incomplete valence shell
(4) Presence of d-orbitals in period 2 elements
Which of the following is NOT an exception to the octet rule?
(1) BeCl2
(2) BF3
(3) CH4
(4) SF6
Which of the following molecules does NOT obey the octet rule?
(1) PF5
(2) H2O
(3) CH4
(4) NH3
Which of the following molecules has an atom with less than an octet?
(1) BeCl2
(2) PCl5
(3) SF6
(4) XeF4
Which of the following molecules is a free radical and violates the octet rule?
(1) O2
(2) NO
(3) CO2
(4) H2O
Which of the following molecules is a free radical?
(1) NO2
(2) CO2
(3) H2O
(4) CH4
Fill in the blank: The central atom in BrF5 has _______ electrons in its valence shell.
Fill in the blank: The central atom in ICl3 has _______ electrons in its valence shell.
Fill in the blank: The central atom in PCl5 has _______ electrons in its valence shell.
Fill in the blank: The central atom in SF6 has _______ electrons in its valence shell.
True or False: All molecules and ions strictly follow the octet rule.
True or False: Elements in period 3 and beyond can have more than eight electrons in their valence shell.
True or False: The molecule ClO2 is an exception to the octet rule because it has an odd number of electrons.
True or False: The octet rule is a universal rule with no exceptions.
