Which of the following molecules satisfies the octet rule for all its atoms?

• A. BF3
• B. CH4
• C. PCl5
• D. NO2

Answer: (B)

Verified step by step guidance

1. 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.
2. 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.
3. 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.
4. 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).
5. 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.