Question

Give reason as to why the atomic radii of elements increase in a group while moving from top to bottom ?

Answer 1

Hey !!!


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Atomic radii ( Atomic size ) increases down the group because of the successive increase in the number of shells

For Example - in alkali metals

Hydrogen - 1 ( 1 shell)

Lithium - 2 , 1 ( 2 shells )

Sodium - 2 , 8 , 1 ( 3 shells )

potassium - 2 , 8 , 8 . 1. (4 shells )

AS THE NO OF SHELLS IS INCREASING AS ON MOVING DOWN IN THE GROUP SO THE ATOMIC SIZE IS ALSO INCREASING ....

Answer 2

Down the group the atomic number of elements increase
So the electrons increased will be added to new shells henceforth increasing the atomic size as the shell number increases