What is the correct Lewis structure for arsenic?
Arsenic is isoelectronic with nitrogen (they are both Group V elements), so there are 5 valence electrons.
Look at the position of arsenic in the Periodic Table. It is under phosphorus, which is under nitrogen. These elements are thus isoelectronic, and their chemistry should be similar to a first approximation.
Consider ammonia versus phosphine versus arsine, i.e.