Arrange the following elements in the order of their decreasing metallic character.
$N a, S i, C l, M g, A l$

C l > S i > A l > M g > N a

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N a > M g > A l > S i > C l

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N a > A l > M g > C l > S i

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A l > N a > S i > C a > M g

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Solution

The correct option is B $N a > M g > A l > S i > C l$
Metallic character depends upon the ability to lose electrons. Metallic character decreases, on moving from left to right in a period because the atomic size decreases, thereby increasing the force of attraction between the nucleus and the outermost electron. Therefore, it becomes difficult for the metal to lose electron from the outermost shell. Therefore, the order is $N a > M g > A l > S i > C l$ .

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Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al

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

N a^{+}

M g^{2 +}

A l^{3 +}

and

S i^{4 +}

are isoelectronic, their ionic size will follow the order:

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Arrange the following elements in the order of their decreasing metallic character.Na, Si, Cl, Mg, Al

Arrange the following elements in the order of their decreasing metallic character.
$N a, S i, C l, M g, A l$