Question

With what neutral molecules is $Cl{O}^{-}$ isoelectronic? Is that molecule a Lewis base?

Answer 1

$CI{O}^{-}$ has (17+8+1=26) 26 electrons. It is isoelectronic with two neutral molecules. These are

(a) Oxygen difluoride $O{F}_2$

(b) Chlorine fluoride $ClF$ Out of these $ClF$ is a Lewis base as it can further donate electrons to more atoms of fluorine.