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Q. How many bonds does $B_{2}$ have?

ManipalManipal 2009The p-Block Elements

Solution:

$B _{2}: K K(\sigma 2 s)^{2}\left(\sigma^{*} 2 s\right)^{2}\left(\pi 2 p_{x}\right)^{1}\left(\pi 2 p_{y}\right)^{1}$
Bond order $=\frac{1}{2}(4-2)=1$