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Classification of Elements and Periodicity in Properties
The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
Ar < K+< Ca2+
Ca2+ < Ar < K+
Ca2+ < K+ < Ar
K+< Ar < Ca2+
B.
Ca2+ < Ar < K+
Ca2+ < K+ < Ar
Ar, K+ and Ca2+ are isoelectronic i.e with the same number of electrons, 18. For isoelectronic species, ionic radii decrease with increases in effective (relative) positive charge. Also Ar, K and Ca belong to the same period.
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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?
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 ?
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