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4.Chemical Bonding and Molecular Structure
medium
Which one of the following species does not exist under normal conditions ?
A
$Be_{2}^+$
B
$Be_2$
C
$B_2$
D
$Li_2$
(AIPMT-2010)
Solution
Be $_{2}$ does not exist.
$\mathrm{Be}_{2}$ has an electronic configuration of:
$\sigma 1 s^{2} \sigma^{*} 1 s^{2} \sigma 2 s^{2} \sigma^{*} 2 s^{2}$
$\text { Bond order }=\frac{4-4}{2}=0$
Thus, Be $_{2}$ does not exist.
Standard 11
Chemistry
