[shehri]

Hi,

    I'm too much confused about structure of Chromate & Di Chromate ions.Plz. tell me the nature Cromium-Oxygen bonding.Thanks.

[Sam (NG)]

I have attached 1 of the lewis structures of each ion to this message (each ion undergoes resonance).  If you want more information about Cr (VI) then go to the library and read the following books (the corresponding section in each):

Greenwood, Earnshaw, Chemistry of The Elements, ISBN: 0-7506-3365-4
Cotton, Wilkinson, Murillo, Bochmann, Advanced Inorganic Chemistry, ISBN: 0-471-19957-5