A) Rb>Na>K>Mg
B) K>Rb>Na>Mg
C) Rb>K>Na>Mg
D) Mg>Rb>K>Na
Correct Answer: C
Solution :
[c] NA, K and Rb are of group 1 elements and size increase down the group 1 elements\[(\downarrow )\]. Na and Mg are of group 1 and 2 elements respectively but both belong to 3rd period. Along the period size decreases (\[\to \]), i.e. Size of Na>Mg.Hence the order of sizes is |
\[\] \[\] |
Group 1 group 2 |
\[\Downarrow \] \[\Downarrow \] \[\Downarrow \] \[\Downarrow \] |
Period\[\Rightarrow \] 5 4 3 3 |
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