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Is BH3 a covalent compound or an ionic compound please explain giving reasons

Is BH3 a covalent compound or an ionic compound please explain giving reasons

Grade:10

3 Answers

Aarti Gupta
askIITians Faculty 300 Points
7 years ago
BH3 or known as borane is an covalent compound as it is formed by sharing of electrons. Boron having atomic no.5 will have atomic configuration 2,3.Thus boron has 3 valence electrons and it is surrounded by three hydrogen atoms each having 1 valence electrons.It shares all three electons of each H atoms which in turn shares its 1 electron by each.In this way both B and 3 H atoms acheive their noble gas configuration.
Thanks & regards
Aarti Gupta
askiitians Faculty
Arpit Kumar
31 Points
7 years ago
But the noble gas configuration for boron should be that of helium,ie,2 electrons in the K shell then why is it so that it shares the electron from the hydrogen atoms Please reply
Aarti Gupta
askIITians Faculty 300 Points
6 years ago
Boron has configuration 2,3 as it has atomic no. 5.Hence it is given as [He],2s2,2p1.So as to acheive noble gas configuration it shares 3 electrons form 3H atoms in BH3 molecule.This happens because it has 3 valence electrons in L shell.Thus by doing so its configuration becomes 2,6.Hence by sharing 3 electrons its configuration becomes similar to that of Ne and not that like of He.

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