Question

what is Atomic radius ?how does atomic radii of the elements change in group?

Answer 1

Hey !


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Atomic radius : Atomic radius is defined as distance between centre of nucleus and outer most shell of an isolated atom.

Atomic size in group : Atomic size generally increases from top to bottom in a group.

Reason : It is die to addition of new shell i.e., number of shells go on decreasing

Atomic size in periods : Atomic size goes on decreasing along a period from left to right

Reason : It is due to increase in nuclear charge which pulls the electrons towards it , i.e., force of attraction between nucleus and valence electrons increases , therefore atomic size decreases.


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Answer 2

Atomic Radius: The distance between the atoms nuclei and the outermost shell.


The atomic radius increases as we go down in a group. This is because a new shell is introduced as we go down the group.

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