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Photoelectric Effect

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Photoelectric effect:         Photon:                  in 1905 Einstein suggest that light(electromagnetic radiations) is made up of tiny particles known as photon . photons are the packets of energy . Einstein suggested that energy is not emitted continuously but is emitted as individual amount of energy known as Quantum energy. Energy of Photon: The energy of photon is given by Einstein                                      E=hv where,                E= energy of photon                h=plank's constant                v=frequency Properties of Photon: Photon have no mass. Photon posses no charge and are not deflected by electric or magnetic field. The values of all quantum number...
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Physical properties of d-block elements

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Physical properties of d-block elements Key points: The properties of the d metals are largely derived from their electronic structure, with the strength of metallic bonding peaking at Group 6; the lanthanide contraction is responsible for some of the anomalous behaviour of the metals in the 5d series. The d block of the periodic table contains the metals most important to modern society. It contains the immensely strong and light titanium, the major components of most steels ( Fe, Cr, Mn, Mo ), the highly electrically conducting copper, the malleable gold and platinum , and the very dense osmium and iridium . To a large extent these properties derive from the nature of the metallic bonding that binds the atoms together. Generally speaking, the same band structure is present for all the d-block metals and arises from the overlap of the (n 1)s orbitals to give an s band and of the nd orbitals to give a d band. The principal differences between the metals is...
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History of coordination chemistry

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An Overview of coordination chemistry Historically, inorganic chemistry is the oldest branch of chemistry. Classical inorganic chemistry was primarily concerned with the preparation and studies of the properties of all the elements and their compounds, including the simple compounds of carbon. It is very difficult to determine the exact date of preparation of the first coordination compound. The chemistry of complexes may be said to have originated in 1704 with the discovery of Prussian blue by Diesbach, a colour maker. After this one might site the investigation of the products of oxidation of ammonical cobalt solution of Tassaert (1799). In the years that followed, Cleve, Wolcott Gibbs, Blomstrand and Fermy did a large amount of effort towards the study of complexes. By 1870, a great deal of information on the complexes had been gathered and it was Prof.Jorgenson who for the first time methodized much of this field by the preparation and characterization of a large number of comp...
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