Consider the elements B, AI, Ga and In. How many of these can form the octahedral ion 
?
Text Solution
Verified by ExpertsThe correct answer is:
C
In 
is +3 with coordination number 6.
• Boron cannot expand its octet (max covalency 4; forms 
only) → cannot give 
.
• Al, Ga, In (from the 
period onward) can expand the valence shell; e.g. 
is known 
thus all three can form 
.
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