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CBSE Class 11-science Answered

Why is K lighter than Na even though having more atomic mass than it ?
Asked by sashank2 | 31 Jan, 2010, 08:20: AM
answered-by-expert 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 | 01 Feb, 2010, 09:51: AM
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