Which element in group 15 has the lowest electronegativity?
Electronegativity decreases down group 15 due to increasing size. Bi (period 6) has the lowest value among N, P, As, and Bi.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev