Question

Total number of electrons involve in tetraborane

Answer 1

Total number of electrons involve in tetraborane is 22.

The structure of diborane that is B₄H₁₀ can be seen in the image attached.

There are 4 B-H-B bridges

1 B-B bond  

2terminal BH₂ groups  

Out of the 12 valence electrons of four boron atoms,  

4 electrons are used in forming four B-H-B bridge bonds

2 electrons are used in one B-B bond  

6 electrons are used in the six terminal B-H bonds.  

Total no. of valence electrons of four boron atoms = 4 x 3 =12  

Valence electrons of ten hydrogen atoms = 10  

Total no. of valence electrons of four boron and ten hydrogen atoms = 22  

Electrons used in 3c-2e four B-H-B bridges = 4 x 2 = 8  

Electrons used in 2c-2e one B-B bond = 2  

Electrons used in six terminal B-H bonds = 6 x 2 = 12