Question
Sun December 16, 2012 By:
 

why is potassium lighter than sodium though it is placed down the sodium?

Expert Reply
Sun December 16, 2012
As we know, on moving down the group, generally there is increase in density. But moving from sodium to potassium, there is increase in charge by 8 units, but atomic radius of potassium increases much due to presence of 3d subshell but in case of sodium, there is no presence of d subshell.
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