or ion:1. Draw the complete Lewis structure of the molecule or ion.2. Determine the total number of electron groups (clouds) surrounding thecentral atom.3. Determine the electron geometry of the groups around the central atom(linear, trigonal planar, etc.)4. Determine the molecular shape of the molecule (linear, bent, trigonalplanar, etc.)5. Determine the molecular polarity (polar vs, nonpolar)6. SCN-, thiocyanate ion (carbon central atom)Lewis structureTotal number of electron groups aroundthe central atomElectron geometryMolecular shapeMolecular polarity

The ion given is SCN- ion with central atom carbon. Since there are 6 valence electrons in S. Hence S will make 2 bonds with C to complete its octet. And there are 5 valence bond in N. Hence N needs total 3 electrons to complete its octet. Since there is 1- charge in the ion and the -ve charge is taken by the most electronegative element which is N. Hence the N will take the 1- charge and will make 2 bonds with C to complete its octet. Now since the N is using 2 valence electrons to make 2 bonds and is gaining 1 electrons. Hence there will be total 2 lone pair electrons remaining around N. And since S is using total 2 valence electrons out of 6 to make 2 bonds. Hence there will be total 2 lone pair electrons around S as well. And C is using all 4 valence electrons to make total 4 bonds. Hence there will be 0 valence electrons around C. Hence the below Lewis structure of the ion.From the above structure we can see that there are 2 double bonds around the central atom C. And each double bond corresponds to 1 electron cloud. Hence there are total 2 electron clouds around the central atom C. Since the central atom C is making only 2 sigma bonds and there is 0 lone pair electron on it. => Number of hybridised orbitals in C = number of sigma bonds + number of lone pair electrons = 2 + 0 = 2 Hence the hybridisation of C = sp. Hence the electron geometry is linear and the molecular geometry is also linear. Since both the C=S bond and C=N bond are polar and can not cancel each other's polarity. Hence the overall ion is polar.