# Chromate ion

1. Sep 25, 2016

### Karan Punjabi

Can some one explain the structure of chromate ion on the basis of hybridisation cause I'm a bit confused I googled about it and there are posts like explaining it as sp3 hybridised ion. Explain please.

2. Sep 25, 2016

### Karan Punjabi

3. Sep 26, 2016

### DrDu

If you really want to describe transition metal compounds in terms of hybrids, I would rather go for $d^3s$ than $sp^3$, as the p orbitals in a highly charged ion like chromium VI are energetically much higher than the d orbitals. The d3s hybrids are directed along the diagonals of a cube. If you allow for a small substitution of d for p, the two directions along the diagonal become unequal and you will get a more tetrahedral shape.

4. Sep 26, 2016

### Karan Punjabi

The inner s orbital ie 3s would be affected by hybridisation or not? And how we are considering hybridisation between 2 orbitals of different shells?

5. Sep 26, 2016

### DrDu

The inner 3s orbital is way too low in energy and completely filled. Hence it won't participate in bonding. There is no prinicpal difficulty with hybridizing orbitals of different sub-shells as long as they are of comparable energy and size.

6. Sep 26, 2016

### Karan Punjabi

Got it. One more thing chromate ion is a complex right?