on moving down the group density increases on increase in atomic no. , but even after that potassium is lighter than sodium ,why ???
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Density is inversely proportional to the volumes of the atoms and directly proportional to their masses. Basically, in the case of sodium and potassium the increase in shell size outweighs the pull of the core on the outer shell electron and so potassium is less dense than sodium. When we more from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass. Due to this potassium is less dense than sodium.
Hiba121:
so we can also say that Rb is lighter than K as its volume is more and density is inversely to volume ..in the same way Cs is lighter than Rb as again its volume increases .but in actual it is not so density increases and does not decreases .
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