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Classification of Elements and Periodicity in Properties
Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
In the third period the filling up of only 3s and 3p-orbitals occur. Therefore, in this period there are only two s- and six p-biock elements. Since the third period (n = 3) starts with Z = 11 and ends at Z = 18, hence the element is chlorine (CI) with atomic number (Z) = 17 which is present in the third period and seventeenth group of the periodic table.
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Give the ‘liquid elements’ in the periodic table.
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?
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