Question

The Lewis diagram for BH2 is:
[H-B-H]-
The electron- pair geometry around the B atom in BH2 is:__________.
There are______lone pair(s) around the central atom, so the geometry of BH2 is________ .

Answer 1

Answer:

Electron pair geometry- trigonal planar

There is one lone pair around the boron atom

The geometry of BH2 is bent

Explanation:

The valence shell electron pair repulsion theory offers a frame work for determining the shape of molecules based on the number of electron pairs of the valence shell of the central atom in the molecule.

In BH2-, the central atom is boron. There is a lone pair on boron. Owing to the lone pair on boron, the molecular geometry of BH2 is bent.

Answer 2

The geometry of the electron pair around the Boron atom in $BH_2$ is called the trigonal planar. In this case, there is a pair of isolated electrons around Boron, which is the central atom, allowing the $BH2$ molecule to have a folded geometry.

We can arrive at this answer because:

• Boron is an element that has three electrons in its valence layer.
• With this, we can find out that it can make three covalent bonds or donate these electrons to achieve chemical stability.
• In the case of the $BH_2$ molecule, boron forms covalent bonds with Hydrogen.
• These bonds allow the Hydrogens to be positioned on either side of the Boron molecule, forcing a pair of their electrons to focus on the center of that molecule, until it is attracted to the extremities.

This allows for a folded geometry around the molecule, allowing Boron to be an exception to the octet rule and achieve stability with 5 electrons in the valence layer.

More information:

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