PART - 1 CH - 4 Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 4 Chemical Bonding and Molecular Structure2 Marks
Question
Use molecular orbital theory to explain why the $Be _2$ molecule does not exist.
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Answer
The atomic number of Be is 4 . It means in $Be _2$ molecule 8 electrons are filled. Hence electronic configuration of $Be _2$ molecule is : $(\sigma 1 s)^2\left(\sigma 1 s^*\right)^2(\sigma 2 s)^2\left(\sigma^* 2 s\right)^2$ or $KK (\sigma 2 s)^2\left(\sigma^* 2 s\right)^2$ Bond order $=\frac{1}{2}[ Nb - Na ]$ $=\frac{1}{2}[4-4]=0$ (zero) The zero value of bond order represents that $Be _2$ molecule do not exist.
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