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Interstitial compounds are formed due to ______.

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Important Questions on The d- and f-Block Elements

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Stainless steel is an alloy of iron with _____.
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The total number of inner transition elements in the periodic table is _____.
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The Lanthanoid elements range from the atomic number ______.
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The Lanthanoids are placed in ______.
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Oxidation states shown by Eu are ______.
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'Chemical Twins' are present in which transition series?
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Nb and Ta  have almost the same atomic size due to _____.
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The first member of the actinoid series is _____.