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

  • Option 1)

    Ca < Mg < P < Cl

  • Option 2)

    Mg < Ca < Cl < P

  • Option 3)

    Cl < P < Mg < Ca

  • Option 4)

    P < Cl < Ca < Mg

 

Answers (1)
V Vakul

As learnt in

Periodicity of atomic radius and ionic radius in period -

In a period from left to right the effective nuclear charge increases because the next electron fills in the same shell. So the atomic size decrease.

- wherein

Li>Be>B>C>N>O>F

 

 and

Size of atom and ion in a group -

In a group moving from top to the bottom the number of shell increases.So the atomic size increases.

- wherein

Li<Na<K<Rb<Cs

 

 In a period from left to right, the effective nuclear charge increases as the electrons fill the same shell and thus, the atomic size decreases. Whereas, in a group, moving from top to bottom, the number of shells increase thereby increasing the atomic radius.

Therefore, the order of increasing atomic radii is:

Cl < P < Mg < Ca


Option 1)

Ca < Mg < P < Cl

This option is incorrect

Option 2)

Mg < Ca < Cl < P

This option is incorrect

Option 3)

Cl < P < Mg < Ca

This option is correct

Option 4)

P < Cl < Ca < Mg

This option is incorrect

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