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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
Covalent character increases with higher charge and smaller cation size (Fajans’ rule). BeCl₂ (Be²⁺, small) has the highest covalent character among group 2 chlorides.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
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