Question

The alkalide ion is:

• A. diamagnetic
• B. represented as $\stackrel{-}{C}{H}_3$
• C. paramagnetic
• D. represented as $\stackrel{+}{C}{H}_3$

Answer 1

The correct option is A diamagnetic

The alkalide ions are anions of alkali metals. Known alkalide ions are $N{a}^{-}$, $K^{-}$, $R{b}^{-}$, and $C{s}^{-}.$

Taking example of $N{a}^{-}$:

$Na\left(1s^{2}2s^{2}2p^{6}4s^1\right)$ $\leftarrow$ Paramagnetic due to one unpaired electron

$N{a}^{-}\left(1s^{2}2s^{2}2p^{6}3s^2\right)$ $\leftarrow$ diamagnetic due to paired electrons.