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As atomic number increases within group 15, the atomic radius ; ( 2 )
Increases only
In the periodic table, the size of the atomic radius will continue to change as the the atomic number of the elements increase. Elements in the same group have the same/similar number of valence electron counts and also similar vacancy counts as well.
Therefore as you go down the group, the atomic number of the elements in the same group increases and in response to that the distance between the nucleus and the outermost shell will also increase ( which is the atomic radius ).
Hence we can conclude that As atomic number increases within group 15,the atomic radius Increases only .
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