11th NCERT Chemistry Chapter 3
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– Classification of Elements and Periodicity in Properties
Summary: Understanding the grouping of elements based on properties leading to the development of the Periodic Table, significance of atomic number and electronic configuration, classification into s, p, d, f blocks, periodic trends, reactivity correlation, ionization enthalpy, and scientific vocabulary usage【4:0†source】.
– Genesis of Periodic Classification
Summary: Historical development of the Periodic Table, contributions of scientists like Johann Dobereiner, John Alexander Newlands, Dmitri Mendeleev, and Lothar Meyer to the Periodic Law and Table【4:1†source】.
– Mendeleev's Periodic Law and Modern Periodic Law
Summary: Mendeleev's table based on atomic masses, modern table organized by atomic numbers, classification into s-block, p-block, d-block, f-block elements, periodic trends in properties, and variations in atomic and ionic radii, ionization enthalpies, electron gain enthalpies, and electronegativity【4:2†source】.
What is the basic theme of organisation in the periodic table?
What important property did Mendeleev use to classify the elements in his periodic table?
What is the basic difference between the Mendeleev’s Periodic Law and the Modern Periodic Law?
On the basis of quantum numbers, why should the sixth period of the periodic table have 32 elements?
Where would you locate the element with Z = 114 in terms of period and group?
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