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The element expected to form largest ion to achieve the nearest noble gas configuration is :

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Important Questions on Classification of Elements and Periodicity in Properties

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The species Ar, K+ and Ca2+  contain the same number of electrons. In which order do their radii increase?
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Covalent bond length of a chlorine molecule is 1.98 Ao. Covalent radius (in Ao) of chlorine atom is _________
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The effective nuclear charge of an element with three valence electrons is 2.60 . What is the atomic number of the element?
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The effective nuclear charge for an electron in n=2 shell in a fluorine atom will be, (calculated according to Slater's rules):
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In the elements of the second period of the modern periodic table, the decrease in atomic radius (pm) is maximum with respect to
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Among the isoelectronic ionsO2-, N3-, Mg2+, Na+, the ions with the least and the highest ionic radius are, respectively
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In general, the properties that decrease and increase down a group in the periodic table, respectively, are :