the molecular shape is; As is in the middle, where the 5 chlorine are surrounding it. this gives a complete orbit for As, but you need to place 6 dots on each chlorine to complete their orbit as well. the name of it is, arsenic pentachloride.
I assume you want the name of each shape, not just the generic polygon which refers to any multi-sided shape. 5 sides - pentagon 6 sides - hexagon 7 sides - heptagon 8 sides - octagon 9 sides - nonagon 10 sides - decagon