In which species does the central atom have one or more lone pairs of valence electrons?

In which species is the central atom not surrounded by exactly 8 valence electrons?

In which , central atom s has have one lone pair of electron ?

In which of the following pairs, the central atoms have the same number of lone pairs of electrons?

In which of the following molecules, the central atom has two lone pairs of electrons ?

In which of the following molecules, the central atom has one lone pair and three bond pairs of electrons.

In which of the following molecules, the central atom has one lone pair and three bond pairs of electrons,

In which of the following, the central atoms has two lone pairs of electrons

In which of the following , central atom does not have one lone pairs of electron ?