write the order of density of 1A group elements
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The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). This trend is shown in the figure below: The metals in this series are relatively light—lithium, sodium, and potassium are less dense than water (less than 1 g cm-3).
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Cs > Rb > Na > K > Li
irregularities between sodium and potassium is bcoz in potassium effect of increased volume i.e. atomic radius is more pronounced than increase in atomic mass
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