Help!! What shape would SeH2 have? Draw the molecule.

Also, if you are good with this kind of thing, please answer my other questions too!

What happens to the atomic radius when an elctron is lost

Why does his teacher ask him to balance the equation by including the correct coefficient

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?