Density of metals increases from top to bottom in a group. But we see that potassium has lower density than sodium. Identify the reason-

Absence of 'd' subshell in sodium.

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Presence of more number of electrons in potassium

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There is no increase in mass from sodium to 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 subshell 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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Density of metals increases from top to bottom in a group. But we see that potassium has lower density than sodium. Identify the reason-

The correct option is A Absence of 'd' subshell in sodium.Due to the absence of d subshell 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 subshell 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.