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Chemistry is a subject of "exceptions." Reading the theory isn't enough; you need to see how the NTA (National Testing Agency) twists these concepts into multiple-choice questions.
). These are isoelectronic species; the one with the highest nuclear charge (most protons) is the smallest. Chemistry is a subject of "exceptions
Note: Cationic radii are smaller than the parent atom; anionic radii are larger. Trend: Increases across a period, decreases down a group. Note: Cationic radii are smaller than the parent
Horizontal rows. The period number corresponds to the highest principal quantum number ( 2. Electronic Configurations The period number corresponds to the highest principal
While historical models (Dobereiner, Newlands, Mendeleev) are important for context, NEET focuses on the : The physical and chemical properties of elements are periodic functions of their atomic numbers.
This is where most "Classification of Elements and Periodicity in Properties NEET questions" come from.