Sodium borohydride, nabh4, and boron trifluoride, bf3, are compounds of boron. what are the shapes around boron in the borohydride ion and in boron trifluoride?

Compound 1: Sodium borohydride
In sodium borohydride (NaBH4), B is a central metal.
Electronic configuration of B is 1s2 2s2 2p1.
B undergoes sp3 hybridization in NaBH4, to generate 4 hybrid orbitals. These hybrid orbitals, forms sigma bond with 4 'H' atoms. Due to this, the structure of sodium borohydride in tetrahedral.


Compound 2: Boron trifluoride
In boron trifluoride (BF3), B is a central metal.
Electronic configuration of B is 1s2 2s2 2p1.
B undergoes sp2 hybridization in NaBH4, to generate 3 hybrid orbitals. These hybrid orbitals, forms sigma bond with 3 'H' atoms. Due to this, the structure of boron trifluoride is triangular planner.

The shape of boron in borohydride ion is tetrahedral and in boron trifluoride is trigonal planar.

Explanation: Formula used

where, V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

1.

The number of electron pairs is 4 that means the hybridization will be and the electronic geometry of the molecule will be tetrahedral.

2.

The number of electron pairs is 3 that means the hybridization will be and the electronic geometry of the molecule will be trigonal planar.

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