Multiple Choice
Which of the following molecules contains an atom with an expanded octet?
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11. Bonding & Molecular Structure
Octet Rule
Multiple Choice
Which of the following molecules satisfies the octet rule for all its atoms?
A
BF3
B
CH4
C
PCl5
D
NO2
Verified step by step guidance1
Recall the octet rule: atoms tend to form bonds until they are surrounded by eight electrons in their valence shell, achieving a stable electron configuration similar to noble gases.
Analyze BF3: Boron has 3 valence electrons and forms three single bonds with fluorine atoms. Count the electrons around boron to see if it has a full octet.
Analyze CH4: Carbon has 4 valence electrons and forms four single bonds with hydrogen atoms. Check if carbon has eight electrons around it after bonding.
Analyze PCl5: Phosphorus has 5 valence electrons and forms five bonds with chlorine atoms. Determine if phosphorus follows the octet rule or if it exceeds it (expanded octet).
Analyze NO2: Nitrogen dioxide is a radical with an odd number of electrons. Examine the Lewis structure to see if all atoms have complete octets or if there are exceptions.
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