Lanthanides are rare earths, but one of ...

Lanthanides are rare earths, but one of them is not available naturally. The element under consideration is

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What are rare earths and transuranic elements?

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f-block elements exhibit different oxidation state, colour, complex formation like properties. The size oflanthanides decreases due to poor screening effect of 4f electrons. It is called lanthanide contraction. Lanthanide hydroxides are basic in nature The colour of lanthanide ion is due to

Screening effect is the effect produced by intervening electron between nucleus and valence electrons. They shield the nucleus from valence electron and effective nuclear charge decreases if there is less shielding effect, the effective nuclear charge decreases. Balance electrons are attracted by nucleus and repelled by other electrons. Net attractive force on electron under consideration =Z- sigma = (Nuclear charge screening effect) which is Slater's formula for screening constant. If one electron is present in outermost orbit, there will be no screening in that orbital. Each electron contributes 0.35 (total electrons minus 1) present in outermost shell. In penultimate energy level, electrons contribute 0.85. A contribution of 1.0 is from remaining electrons (present in last but one energy level). The effective nuclear charge for 4s electrons of Zn will be

What are "rare earths" and "trans-uranic" elements?

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AAKASH SERIES-D - BLOCK ELEMENTS-PRACTICE EXERCISE

As the oxidation state of metal in metal oxide increases its acidic na...
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Highest oxidation state exhibited by a lanthanide element is
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Lanthanides are rare earths, but one of them is not available naturall...
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The element with highest number of unpaired L electrons is
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Colour exhibited by divalent Sm in aqueous solutions
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Which of the following is paramagnetic ?
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Compound that is both paramagnetic and coloured is
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Acidic oxide is formed by the metal and oxidation state of the metal i...
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In the preparation of KMnO4, pyrolusite (MnO(2)) is first converted to...
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Which of the following can be employed for the conversion of potassium...
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The reaction MnO(4)^(-)+e^(-)hArrMnO(4)^(2) takes place in
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When MnO(2) is fused with KOH in the presence of air, a coloured compo...
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Acidified potassium dichromate is treated with hydrogen sulphide. In t...
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The equivalent mass of K(2)Cr(2)O(7) when it acts as oxidising agent i...
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The aqueous solution containing which one of the following ion will be...
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Effective magnetic moment of Sc^(3+) ion is
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The stable oxiation state of Cu, Ag and Au are respectively
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Highest oxidation state exhibited by a lanthanide element is
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Larger number of oxidation states are exhibited by the actinoids than ...
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Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
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