Question

atomic radii of element increases on going down the group in periodic table.Why?

Answer 1

On going down the group one extra shell keep on adding

Answer 2

Answer:

THE PROPERTIES OF ELEMENTS DEPEND UPON VALENCE ELECTRONS IN THE ATOM WHICH IN TURN DEPENDS ON THE THE ATOMIC NUMBER . THEREFORE , ATOMIC NUMBER IS A MORE APPROPRIATE PARAMETER THEN ATOMIC MASS FOR THE DEVELOPMENT OF MODERN PERIODIC TABLE.