define bridge bond .. and how they formed?​

A bridge bond, also known as a banana bond, is a type of covalent chemical bond where two atoms are connected through their orbitals in a manner that forms a bridge. This bond is most commonly found in diborane (B2H6).

Here's how they are formed:

1. Diborane has two boron atoms and six hydrogen atoms. The boron atoms are in sp3 hybridization state, which means they have four hybrid orbitals each.

2. Two of these orbitals form normal covalent bonds with hydrogen atoms. The third orbital overlaps with the orbital of the other boron atom, forming a B-B sigma bond.

3. The fourth orbital of each boron atom forms a bridge bond with two hydrogen atoms. This happens because the orbital contains two electrons, one from the boron atom and one from one of the hydrogen atoms. The other hydrogen atom donates its electron to form a bond with the boron atom.

4. This results in a three-center two-electron bond, where the two electrons are shared between three atoms (the two hydrogen atoms and the boron atom). This is the bridge bond.

5. The same process happens with the other pair of hydrogen atoms, forming another bridge bond.

6. The result is diborane, with two bridge bonds.