Which order of relative size among the following is incorrect?

L i < N a < K

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C < S i < A l

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M g > A l < N a

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F < C l < B r

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Solution

The correct option is C $M g > A l < N a$
Atomic size increases down the group as the new shell is added successively while this atomic size decreases across the period. $N a$ is present in group $1, M g$ is an alkaline earth metal and present in group $2$ while $A l$ is present in group $13$ across the same period. So, the correct order of relative size is $N a > M g > A l$ .

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Arrange the following elements in the order of their decreasing metallic character
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(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

The first ionistation enthalpies of Na, Mg, Al, and Si are in the order
(a) Na< Mg > Al < Si (b) Na> Mg > Al > Si
(c) Na< Mg< Al< Si (d) Na> Mg> Al < Si

$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is