Question

An element of group 15 has atomic number 15. Write the number of shells in its configuration. Write its configuration and find its valency. Examine if this element will have metallic properties or not.

Answer 1

The element with atomic number 15 belonging to group 15 is present in third period (Period-3). It has therefore, three shells. The element is Phosphorus (P), Configuration = 2, 8, 5, Valency = 5 or 3 (8-5=3) Nature = Non-metal.