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Question

Which of the following has a octet/duplet electronic configuration?

A
B3
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B
B
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C
B3+
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D
B2+
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Solution

The correct option is C B3+
The atomic number of Boron =5
Electronic configuration of Boron is: [He] 2s2 2p1
Configuration of valence shell: 2s2 2p1
It does not have a complete octet.

a) B3
Electronic configuration of B3 (with 8 electrons) is: [He] 2s2 2p4
Configuration of valence shell: 2s2 2p4
It does not have a complete octet.

b) B
Electronic configuration of B ( with 6 electrons) is: [He] 2s2 2p2
Configuration of valence shell: 2s2 2p2
It does not have a complete octet.

(c) B3+
Electronic configuration of B3+ (with 2 electrons) is: [He]
Configuration of valence shell: 1s2
Boron is most likely to form B3+ as it forms an inert gas electronic configuration of Helium (satisfying duplet).

(d) B2+
Electronic configuration of B2+ ( with 3 electrons) is: [He] 2s1
Configuration of valence shell: 2s1
It does not have a complete octet.

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