Question

valency of boron in boron hydride BH3​

Answer 1

Answer:

There are 6 valence electrons in BH3. Boron atom gives 3 valence electrons and each hydrogen atom gives 1 valence electron.

Answer 2

Answer:

Valency of Boron in BH$_{3}$ is 3

Explanation:

Borane (BH$_{3}$) is a lewis acid having one boron atom and three hydrogen atoms.

Lewis structure of Borane shows that each hydrogen atom is bonded with boron using a single bond and no lone pairs around it. therefore it is sp$_{2}$ hybridized and forms a trigonal planar shape.

so electron configuration of Boron:

$_{10}B^{5}$→[He] 2s$_{2}$ 2p$_1}$

The Valency of Boron in BH$_{3}$ is 3  

(note: BH$_{3}$ exists in dimer state ($B_{2} H_{6}$) then valency of boron in borane turns into 4 and has a tetrahedral structure)