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Classification of Elements and Periodicity in Properties
Question
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For each of the following pairs, state which one is larger in size and why?
(i) Na, Na+     (ii) Br, Br-    (iii) Br, I

Answer

(i) Na, Na+ pair. The size of Na atom is greater because the cation i.e. Na+ is formed by the loss of one electron from the atom.
(ii) Br, Br- pair. The size of Br- ion is greater as anion is formed by the gain of one electron by bromine atom.
(iii) Br, I pair. The size of 1 is greater because it comes after Br in the halogen family and atomic size increases down the group.

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

How many elements are placed in each period of the p-block?

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?