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Classification of Elements and Periodicity in Properties
What are the merits and applications of Mendeleev's Periodic table?
The periodic table has following merits and applications:
(i) Prediction of new elements: Mendeleev left various vacant places in his table which provided a clue for the discovery of new elements.
(ii) Determination of correct atomic masses. This table has also been useful in correcting the doubtful atomic masses of some elements.
(iii) In research work. Periodic table provided useful information which helped in stimulating research work.
(iv) Prediction of properties. The properties of elements and their compounds can be predicted from their positions in the table.
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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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