Question

Drawing the structural formula for hydrogen astaside?

Answer 1

No, of course not. The formula for hydrogen is H-O-H. Hydrogen peroxide is H-O-O-H.
I know that. I fixed the question; maybe it will make more sense now. The formula of the compound formed between astatine and calcium would be something like \[AtCa^2\]?

Answer 2

I think you mean hydrogen astatide. That's H-At