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a
K-density less than sodium
b
K-photo electric cells
c
Na-most abundant alkali metal in earth's crust
d
Na-Present in Chlorophyll
answer is D.
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Detailed Solution
"Mg" -present in chlorophylldensity Order: Li>K>Na>Rb>Cs As atomic mass increases density should increases but density of "K" is less than that of Na[K < Na]Reason: The atomic size of "K" is exceptionally high [large] due the presence of vacant"3d" - orbitals.Hint: d∝1VK - 1s2 2s2 2p6 3s2 3p6 4s1Na - 1s2 2s2 2p6 3s1