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Classification Of Elements And Periodicity In Properties

Question
CBSEENCH11005478
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What is ionic radius?

Solution
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. 

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

What is the number of groups in: (i) p-block  (ii) d-block?

How many elements are present in:
(i) second period    
(ii) fourth period    
(iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s23d10 belongs?

Why are there 10 elements in each series of d-block?

In terms of electronic configuration,
what is common in a given period and group?

Give the general electronic configuration of
(i) Transition elements     (ii) Inner transition elements.

Name the group and period to which an element with Z = 15 belongs ?

What are the advantages of periodic classification of elements?

In the modern periodic table, the period indicates the value of:
(a) atomic number
(b) atomic mass
(c) principal quantum number
(d) azimuthal quantum number.

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