Two or more than two species having same structure (shape), those species are called isostructural.
We know that, to identify the shape of any molecule.
First we caculate the hybridisation of that molecule.
The formula of identify hybridisation is =
No. of valance electron present in outermost shell of central atom+no of monovalent atom +Charge/2
After calculating Hybridisation , identify the shape of that molecule.
We take a example of methane (CH4) molecule.
Hybridisation of methane = ...
No of valnce electron present in outermost shell of central atom (carbon) =4 electron
No. of monovalent atom = 4
There is no charge on molecule.
Hybridisation = 4+4/2 = 4 (sp^3)
According to VSEPR theory, the shape of molecule is tetrahedral .
We take another example :
CCl4 (atomic no of carbon =6 , and Cl=17)
No of valence electron present in carbon atom = 4
No. of monovalent atom = 4
Hybridisation = 4+4/2 =4 (sp^3)
The shape of CCl4 is tetrahedral.
Therefore: Both molecule has tetrahedral shape or geometry.
Both molecules are isostructural.
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