Periodic Classification and Periodic Properties - Result Question 15

####12. Identify the least stable ion amongst the following.

(a) $Li^{+}$

(b) $Be^{-}$

(c) $B^{-}$

(d) $C^{-}$

(2002, 3M)

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Answer:

Correct Answer: 12. (b)

Solution:

  1. $Be^{-}$is the least stable ion, $Be\left(1 s^{2} 2 s^{2}\right)$ has stable electronic configuration, addition of electron decreases stability.


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