Which of the following ions is most unlikely | vedclass

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Question

(B) The $Be^{-}$ ion is the most unlikely to exist because $Be$ has a stable fully filled $2s^2$ electronic configuration. Adding an electron to $Be$

Vedclass · Accepted Answer

$Be^{-}$

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(B) The $Be^{-}$ ion is the most unlikely to exist because $Be$ has a stable fully filled $2s^2$ electronic configuration. Adding an electron to $Be$ would require placing it into the $2p$ orbital,which is higher in energy and destabilizes the atom. Furthermore,$Be$ has a positive electron gain enthalpy,meaning it has a strong tendency to lose electrons rather than gain them.

Which of the following ions is most unlikely to exist?

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