JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

1 Easy

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Analyzing +4 | -1

The least stable ion among the following is

View answer and explanation

Correct option: B

B{e^ - }

Option B (

Be^−

) is the least stable ion because beryllium has a fully filled 2s subshell (

1s^22s^2

), making it less likely to accept an additional electron.

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\mathrm{O}, \mathrm{O}^{2-}, \mathrm{F}

\mathrm{F}^{-}