H2SO4 questions

Hi,

My book states that the resonance structures with a 2+ formal charge on sulfur and a - charge on the oxygens without hydrogens is the "normal structure". I don't see this one through.
Why not the structure where the formal charge on each atom is 0?

My book states that this "normal structure helps explain how H2SO4 donates a proton.

Can anyone guide my understanding on this one?
Please help.
Thanks!

I didn't find the right help from the Internet.

References: www.chemicalforums.com/index.php?topic=26724.0

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