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Classification of Elements and Periodicity in Properties
Why do halogens have very higher value of electron gain enthalpy?
This is due to the fact that halogens have the general electronic configuration of ns2np5 and have only one electron less than the stable noble gas (ns2np6) configuration. In order to acquire the noble gas configuration, halogens have a very strong tendency to accept an additional electron and their electron gain enthalpies become more negative.
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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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