The correct order of atomic radii is :
N > Ce > Eu > Ho
Ho > N > Eu > Ce
Eu > Ce > Ho > N
Ce > Eu > Ho > N
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
As we have leaved in atomic radii
we know that
therefore
Option 1)
N > Ce > Eu > Ho
Option 2)
Ho > N > Eu > Ce
Option 3)
Eu > Ce > Ho > N
Option 4)
Ce > Eu > Ho > N
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