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Classification of Elements and Periodicity in Properties

Significance of classification, brief history of the development of periodic table, modern periodic law and the present form of periodic table, periodic trends in properties of elements –atomic radii, ionic radii, inert gas radii, ionization enthalpy, electron gain enthalpy, electronegativity, valence. Nomenclature of elements with atomic number greater than 100.

11th Chemistry NCERT notes

Periodic Trends in Properties of Elements

Trends in Physical Properties There are numerous physical properties of elements such as melting and boiling points, heats of fusion and vaporization, energy of atomization,...
11th Chemistry NCERT notes

Modern Periodic Table

Modern Periodic table (1913) Mostly modified Mendeleev’s periodic law. He stated “Physical and chemical properties of elements are the periodic function of their atomic...
11th Chemistry NCERT notes

Brief History of the Development of Periodic Table

Dobereiner’s Triads (1829) Dobereiner classified the elements into groups of three elements with similar properties in such a manner so that the atomic weight of...