Atomic Radius

Properties of the individual atoms Properties like valency ,atomic and ionic radii, ionisation enthalpy ,electron gain enthalpy, electronegativity are the properties of the individual atoms and are directly related to the electronic configuration. Properties of group of atoms Properties like melting point, boiling point ,heat of fusion and vaporisation, energy of atomisation, density ,atomic volume …

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Modern Periodic Table

Modern periodic law states that physical and chemical properties of the elements are periodic function of the atomic numbers i.e.if the elements are arranged in order of their increasing atomic numbers, the elements with similar properties are repeated after certain regular intervals. Atomic mass depends upon the number of protons and neutrons in the nucleus …

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Mendeleev’s Periodic Law And Table

He examined the relationship between atomic weights of the elements and their physical and chemical properties.Among chemical properties, Mendeleev mainly concentrated on the compounds formed by the elements with hydrogen and oxygen because they are highly reactive and hence formed compounds with almost all the elements. The formulae of the hydrides and oxides formed by …

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Energy Level Diagram

Energies of orbitals of hydrogen and hydrogen like particles depend upon the value of principal quantum (n) number only , those of multi-electron atoms depend both upon principal quantum number( n ) as well as azimuthal quantum number(l). Diagram representing the arrangement of orbitals in order of their increasing energies are called energy level diagrams. …

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