isoelectronic and isostructurl

well all the three are isostructural and yeah they have the structure of planar triangle,

central atom is sp² hybridized and

@Euclid,

all three are isoelectronic also, they all have 24 outer electrons

Two or more molecular entities (atoms, molecules, ions) are described as being isoelectronic with each other if they have the same number of electrons or the same electron configuration and the same structure (number and connectivity of atoms), regardless of the nature of the elements involved.

The term valence isoelectronic is used when the above conditions are met but with only the same number of valence electrons.

@ Euclid. So the first two are Isoelectronic
@ Khyati. So the three are valence Isoelectronic.

But Which one to answer? I don't know?

Now, what am gonna write is the correct answer.

The three mention above are isotructural, because all three has the same structure,i.e,planar triangle.

Now coming whether they are isoelectronic or not ?

well they all contain 24 outer or valence electron (count the electrons in the valence electron

of each atom and sum them up and also include the charge on the ion). but among these

three only CO₃^-2 and NO₃^- are isoelectronic, SO₃ is

not because the S atom has three shells of electron, so there is possibility of using d orbitals in

the bonding scheme.

@ Akhil,

Give an explanation for your answer, prove it and then I shall tell why they are isostructural.

Anyways actually they are, they all have the structure of planar triangle.