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Question
Identify the least stable ion among the following.
Options:
A .  Li−
B .  Be−
C .  B−
D .  C−
Answer: Option B
:
B
Here we are going to compare these with each other and find out which is the least stable. But these species might not exist due to inherent instability.
Electronic configuration of Li - (2) fully-filled, so relatively more stable.
Be - (2,1) less stablethan Be (2);
B - (2,2) relatively stable;
C - (2,3) relatively stable.

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