Which group 15 element forms a trichloride with the highest covalent character?
Covalent character (Fajans’ rule) increases with smaller size and higher charge density. NCl₃ (N, smallest) has the highest covalent character among N, P, As, and Sb trichlorides.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table