Question:

Among the elements $Ca, Mg, P$ and $Cl$, the order of increasing atomic radii is -

Updated On: Aug 1, 2024
  • Cl < P < Mg < Ca
  • P < Cl < Ca < Mg
  • Ca < Mg < P < Cl
  • Mg < Ca < Cl < P
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The Correct Option is A

Solution and Explanation

With increase in the number of electrons in the same shell, the atomic radii decreases due to increase in effective nuclear charge. However, atomic radii increases, as the number of shells increases. Thus, on moving down a group atomic radii increases. The electronic configuration of the given elements is

$M{{g}_{12}}=[Ne]3{{s}^{2}}$
$C{{a}_{20}}=[Ar]4{{s}^{2}} {{P}_{15}}=[Ne]3{{s}^{2}}3{{p}^{3}}$
$C{{l}_{17}}=[Ne]3{{s}^{2}}3{{p}^{5}}$
In $Mg, P$ and $Cl$, the number of electrons are increasing in the same shell, thus the order of their atomic radii is
$Cl
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Concepts Used:

Haloalkanes and Haloarenes - Classification

Classification of Haloalkanes and Haloarenes are as follows:

Haloalkanes and Haloarenes are Classified on the Basis of the Number of Halogen Atoms:

These are further classified as mono, di, or polyhalogen (tri-,tetra-, etc.) compounds depending on whether they contain one, two or more halogen atoms in their structures. For example;

  • Monohaloalkane
  • Dihaloalkane
  • Trihaloalkane

Haloalkanes and Haloarenes are Classified on Compounds Containing sp3 C—X Bond (X= F, Cl, Br, I)

This class includes:

  • Alkyl halides or haloalkanes (R—X)
  • Allylic halides
  • Benzylic halides

Haloalkanes and Haloarenes are Classified on Compounds Containing sp2 C—X Bond

This class includes:

  • Vinylic halides
  • Aryl halides