The correct order of atomic radii is :

Option 1)  N > Ce > Eu > Ho

Option 2)  Ho > N > Eu > Ce

Option 3)  Eu > Ce > Ho > N 

Option 4)  Ce > Eu > Ho > N 

Answers (1)

Atomic Radius -

The distance from the centre of the nucleus to the outermost shell containing the electrons is called atomic radius.It can be measured by the spectroscopic method and by x-ray diffraction or electron diffraction techniques.

-

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

As we have leaved in atomic radii

we know that

therefore

Eu>Ce>HO>N

 

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