Classification of Elements and Periodicity in Properties

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What is ionic radius?

Ionic radius may be defined as the effective distance from the centre of the nucleus of the ion to which it exerts its influence on its electron cloud, The internuclear distance in any ionic compound is determined from X-ray measurements. This distance is then taken equal to the sum of the radii of positive and negative ions involved. Thus, if we know the radius of one ion, that of the other ion can be calculated. 
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    Define atomic size or atomic radius of an element. Why is it not possible to determine its absolute value?
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    What do you mean by covalent radius?

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    How do atomic radius vary in a period and in a group? How do you explain the variation?

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    Why do the noble gas elements have exceptionally high atomic radii?
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    In a period, generally the size of the atom decreases with rise in atomic number, but at the end of each period, atomic size of the noble gas increases abruptly. Why is it so?

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    Define vander Waal’s radius and compare it with covalent radius.
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    Atomic radii of noble gases are essentially the vander Waal's radii. Comment.

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    Why is the radius of cation less than that of parent atom?

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    Why is the radius of anion more than that of the parent atom?

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    Long Answer Type

    What does atomic radius and ionic radius really mean to you?

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