Classification of Elements and Periodicity in Properties - Result Question 18
####18. Among the elements $Ca, Mg, P$ and $Cl$, the order of increasing atomic radii is :
[2010]
(a) $Ca<Mg<P<Cl$
(b) $Mg<Ca<Cl<P$
(c) $Cl<P<Mg<Ca$
(d) P $<Cl<Ca<Mg$
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Solution:
(c) \begin{tabular}{llll} $ _{12} Mg$ & $ _{15} P$ & $ _{17} Cl$ & $ _{20} Ca$ \\ 160 & 110 & 99 & $197(pm)$ \end{tabular}
So, the order will be: $Cl<P<Mg<Ca$
