PERIODIC TABLE: Classification of Elements - JEE/NEET

Explore the birth of the periodic table and its evolution from early groupings by Dobereiner and Newlands to Mendeleev's mass-based table, its exceptions, and Moseley's atomic-number law.

Explore how the electronic configurations of elements organize the periodic table, and understand symbol notation and naming conventions used to classify elements.

Understand how electronic configuration places elements into s, p, d, and f blocks, with hydrogen and helium exceptions, and relate metallic character and oxidation states to periodic trends.

Explains periodic trends in element properties, contrasting physical and chemical properties, and shows how atomic radius varies across periods and groups due to effective nuclear charge and shielding.

Explore how ionisation energy and electronegativity vary across periods and down groups, with exceptions like oxygen, and learn how atomic size and effective nuclear charge shape chemical properties.

Explore periodic trends in chemical properties, including oxidation states and atomic size, and examine anomalous behaviors across groups and transition elements.