Why is K lighter than Na even though having more atomic mass than it ?

Asked by sashank2 | 31st Jan, 2010, 08:20: AM

Expert Answer:

Density (mass/volume) of K is less than that of Na. As we move down the group atomic size increases and mass also increases. But in case of K increase in atomic size compensates more than increase in mass. Hence K is lighter than Na

Answered by  | 1st Feb, 2010, 09:51: AM

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