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22) consider the following statements: (a) the size of the lanthanide m ions decreases as the atomic number of m increase. (b) electronic spectra of lanthanides
22) Consider the following statements: (a) The size of the lanthanide M ions decreases as the atomic number of M increase. (b) Electronic spectra of lanthanides show very broad band. (c) As with transition metals, coordination number six is very common in lanthanide complexes. Which of the statements given above is/are correct a) I only (b) Ill only (c)I and Il (d) Iand I
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Priyanshu kumar Best Answer
check
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option C
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absorption spectra graph gives sharp peak na
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broad bands with a sharp peak
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see sir
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.
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wait let me confirm
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it shows three
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so broad is intense...so IInd is right
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narrow bands are of weak intensities
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agr sir option me narrow diya hota toh ??
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may be intense and weak mention kare
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ok sir
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Dinesh khalmaniya 1![best-answer]()
option C In lanthanides, the additional electron enters 4f sub-shell but not in the valence shell namely sixth shell. The shielding effect of one electron in 4f sub-shell by another in the same sub-shell (i.e. mutual shielding effect of 4f electrons) is very little, being even smaller than that of d-electrons because the shape of f-sub shell is very much diffused. The nuclear charge (i.e. atomic number), however, increases by unity at each step. Thus, the nuclear charge increases at each step, while there is no comparable increase in the mutual shielding effect of 4f electrons. This results in that electrons in the outermost shell experience increasing nuclear attraction from the growing nucleus. Consequently, the atomic and ionic radii go on decreasing as we move from 57La and 71Lu. Due to higher number of electrons, electronic spectra of lanthanides show very broad bands.
absorption spectra graph gives sharp peak na
yes
sharp and broad peak
sir narrow diya h
1 min
check this reference
allowed 4F-4F transition is broad