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Classification of Elements and Periodicity in Properties
How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?
The above statement is wrong because electronegativity of any given atom is not constant but varies with the state of hybridization and the oxidation state of the element. The electronegativity increases as the percentage of s-character of a hybrid orbital increases or oxidation state of the element increases. For example, the electronegativity of N increases as we move from sp3-sp2-sp hybrid orbitals. Similarly,electronegativity of N is different in NO3 and NH3.
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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?
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