Select the correct order of density.

Na > K

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Na < K

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Mg > Ca

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Mg < Ca

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Solution

The correct options are
A Na > K
C Mg > Ca
The trend of density amongst alkali metals: $L i < K < N a < R b < C s$

The trend of density amongst alkaline earth metals: $C a < M g < B e < S r < B a < R a$

Hence the correct choices are $N a > K$ and $M g > C a$

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