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

Asked by  | 16th Dec, 2012, 08:45: AM

Expert Answer:

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.

Answered by  | 16th Dec, 2012, 09:08: AM

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