1. Tardigrade
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  3. Chemistry
  4. Which one of the following molecules/ions does not exist?

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Q. Which one of the following molecules/ions does not exist?

Chemical Bonding and Molecular Structure

Solution:

$Be_2$ does not exist.
$Be_2$ has an electronic configuration of :
$\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^*2s^2$
$\therefore $ Bond order $= \frac{4 - 4}{3} = 0$
Thus, $Be_2$ does not exist.