How many non- bonding pairs in Si2O?

Answer 1

If you mean SiO2, which is a macromolecule- each silicon is bonded to 4 oxygen atoms and each oxygen to two silicon atoms. There are no non-bonding pairs of electrons on the on the silicon atom but ther are two on each oxygen atoms.

Answer 2

In Si2O, silicon usually forms 4 covalent bonds and oxygen forms 2 covalent bonds. Therefore, for Si2O, there are usually two non-bonding pairs on each oxygen atom, resulting in a total of four non-bonding pairs in the molecule.