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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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Chemistry of d-block elements

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Definition of d-block elements The elements of periodic table belonging  to group 3 to 12 are known as d-Block  elements . because in these elements last  electron enters in d sub shell or d orbital  The d -block elements lies in between s- and  p-block elements in the long form of  periodic table. Electronic Configuration •          Across the 1 st row of the d block (Sc to Zn) each element –         has 1 more electron and 1 more proton –         Each “additional” electron enters the 3d sub-shell –         The core configuration for all the period 4 transition elements is that of Ar •          1s 2 2s 2 2p 6 3s 2 3p 6 Energy level of Argon Energy level of Transition metals Chromium and Copper •    ...
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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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