Density of metals increases from top to bottom in a group. But potassium has lower density than sodium. Why?

Absence of d-subshell in sodium

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Presence of more number of electrons in potassium

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Increase of nuclear charge in potassium

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There is no increase in mass from sodium to potassium

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Solution

The correct option is A Absence of d-subshell in sodium
Due to the absence of 'd' sub-shell in sodium, there is large increase in atomic volume from Na to K. As increase in volume is more than increase in mass, there is decrease in density from sodium to potassium.

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Potassium metal is commercially prepared by the reduction of molten KCl with metallic sodium is $850^{0}$ C (1123K). This method is based upon the following principle

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Density of metals increases from top to bottom in a group. But potassium has lower density than sodium. Why?

The correct option is A Absence of d-subshell in sodiumDue to the absence of 'd' sub-shell in sodium, there is large increase in atomic volume from Na to K. As increase in volume is more than increase in mass, there is decrease in density from sodium to potassium.

The correct option is A Absence of d-subshell in sodium
Due to the absence of 'd' sub-shell in sodium, there is large increase in atomic volume from Na to K. As increase in volume is more than increase in mass, there is decrease in density from sodium to potassium.