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Classification of Elements and Periodicity in Properties
What was the need for the classification of elements?
In chemistry 114 element are known. The most of elements take a part in variety of chemical transformations to number of substances and it is also very difficult to study the properties of all these element and their compound individually. Thus in order to solve this problem it is necessary to classify the element.
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What is valency of an element?
Gallium was named by Mendeleev as
What are magic numbers?
Which property is the basis of long form of periodic table?
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?
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