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Atomic radius goes on increasing down a ...

Atomic radius goes on increasing down a group.

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(i) Atomic radius is the distance between the centre of the atom to its outermost shell.
(ii) New shells are added to the atoms of the elements as we go down from top to bottom in a group.
(iii) The outermost electrons go further and further away from the nucleus, extending the radius and ultimately increase in the size of the atom. Hence, atomic radius goes on increasing down a group.
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