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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Context: The Lewis structure of SF6 shows that sulfur is surrounded by six fluorine atoms.
How many valence electrons does sulfur have in SF6?
Describe what is meant by a 'duplet' in the context of the octet rule.
Describe what is meant by an 'expanded octet'.
Explain why boron trifluoride (BF3) is an exception to the octet rule.
Explain why elements in the second period (like carbon, nitrogen, and oxygen) cannot have expanded octets.
Explain why hydrogen does not follow the octet rule.
Context: The Lewis structure of NO shows that nitrogen has only 7 electrons in its valence shell.
Is NO an exception to the octet rule? (Yes/No)
Context: The Lewis structure of SF6 shows that sulfur is surrounded by six fluorine atoms.
How many valence electrons does sulfur have in SF6?
Which of the following atoms is most likely to form a molecule with an incomplete octet?
(1) Nitrogen
(2) Beryllium
(3) Oxygen
(4) Chlorine
Which of the following elements is most likely to obey the octet rule when forming compounds?
(1) Sodium (Na)
(2) Neon (Ne)
(3) Carbon (C)
(4) Hydrogen (H)
Which of the following is a molecule with an expanded octet?
(1) CO2
(2) SF6
(3) H2O
(4) NH3
Which of the following is NOT a reason for exceptions to the octet rule?
(1) Presence of d orbitals
(2) Odd number of electrons
(3) Small size of atom
(4) All atoms are metals
Fill in the blank: An atom with less than eight electrons in its valence shell is said to have an ______ octet.
Fill in the blank: Atoms achieve stability by attaining the electron configuration of the nearest ______ gas.
Fill in the blank: In BeCl2, beryllium has only ______ electrons in its valence shell.
Fill in the blank: The central atom in BF3 has only ______ electrons in its valence shell.
Context: The Lewis structure of NO shows that nitrogen has only 7 electrons in its valence shell.
Is NO an exception to the octet rule? (Yes/No)
True or False: All elements always follow the octet rule when forming chemical bonds.
True or False: Elements in period 3 and beyond can have more than eight electrons in their valence shell.
True or False: Helium is stable with only two electrons in its outer shell.
