Answer 1
8 valence electrons (As has 5 valence electrons, each H has 1)
H

:As–H

H
lone pair on As (central atom) to satisfy the octet rule on As.
Answer 2
Ash3 Lewis Structure
Answer 3
I cant draw the structure by this. But i think the answer is As has 3 bond pairs with 3 H and 1 lone pair
Answer 4
2HAsH
two hydrogens on the left side and one hydrogen on the right side