Final answer:
option b,Pnictogens are chemically distinct as a group, with properties like high electronegativity, low melting and boiling points for lighter pnictogens, and poor conductivity of electricity.
Step-by-step explanation:
The properties of pnictogens (nitrogen group elements) include characteristics such as existence in diatomic form (like N₂), high electronegativity, low melting and boiling points for the lighter elements in the group, and typically being poor conductors of electricity in their most stable forms.
When considering substances across different categories - considering, for example, alkali metals, noble gases, halogens, and elements with specific atomic numbers or configurations - elements show varying properties. However, in the case of pnictogens, they may exhibit covalency in their bonding, display varying reactivity (especially nitrogen, which can be quite reactive), and possess a range of physical structures from gaseous to solid at room temperature.
For instance, nitrogen (N₂) is a gaseous diatomic molecule that is relatively inert under normal conditions, arsenic and antimony are metalloids, and bismuth is a metal with higher melting and boiling points compared to its lighter congeners.