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Classification of Elements and Periodicity in Properties
Which of the following elements has more negative electron gain enthalpy?
(i) [Ne] 3s2sp3
(ii) [Ne] 3s23p4
(iii) [Ne] 3s2 3p5
The element (chlorine) corresponding to the electronic configuration (iii) will have more negative electron gain enthalpy. This is due to the reason that it contains one electron less than the stable noble gas configuration i.e. [Ne] 3s2 3p6 and hence, has a strong tendency to accept one electron to acquire the stable gas configuration.
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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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