Periodic Classification And Periodic Properties Result Question 4
4. The correct order of the atomic radii of $\mathrm{C}, \mathrm{Cs}, \mathrm{Al}$ and $\mathrm{S}$ is
(2019 Main, 11 Jan I)
(a) C $<$ S $<$ Al $<$ Cs
(b) C $<$ S $<$ Cs $<$ Al
(c) S $<$ C $<$ Cs $<$ Al
(d) S $<$ C $<$ Al $<$ Cs
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Answer:
Correct Answer: 4. ( a )
Solution:
With the addition of a new shell, period number as well as atomic radius increases. It is because of the successive addition of one extra shell of electrons. So, the order of the atomic radii of the given elements will be: $\mathrm{C}<\mathrm{S}<\mathrm{Al}<\mathrm{Cs}$
BETA
