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Classification of Elements and Periodicity in Properties
Why atomic number is a better basis for classifying the elements than atomic mass?
The atomic mass of the element relates to the nucleus which is present in the centre of the atom. But the properties of the elements depend upon the electronic configuration which is linked with atomic number. Therefore, atomic number is a better basis for the classification of the elements than the atomic mass.
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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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