Electronic Configuration, Oxidation States — Prelims Strategy
Prelims Strategy
To effectively tackle NEET questions on electronic configuration and oxidation states of Group 16 elements, a multi-pronged strategy is essential. Firstly, memorize the general valence electronic configuration () and the specific configurations for Oxygen, Sulfur, Selenium, Tellurium, and Polonium.
Pay close attention to the presence or absence of d-orbitals. Secondly, understand the rules for assigning oxidation states (sum to zero for neutral compounds, sum to charge for ions, electronegativity rules for covalent bonds).
Practice calculating oxidation states for various compounds, especially peroxides, superoxides, and compounds with fluorine. Thirdly, focus on the unique behavior of oxygen: its high electronegativity, lack of d-orbitals, and limited positive oxidation states (only with fluorine).
Fourthly, grasp the concepts of d-orbital expansion (for S, Se, Te) and the inert pair effect (for Te, Po) and how they influence the range and stability of oxidation states. For numerical problems (oxidation state calculations), be meticulous with arithmetic.
For conceptual questions, always link the observed behavior back to the electronic configuration and fundamental principles. Be wary of trap options that generalize properties across the entire group without considering periodic trends or specific element characteristics.