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

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$\begin{matrix} S t e p & M e t h o d & A p p l y S t e p I & W r i t e t h e e l e c t r o n i c c o n f i g u r e a t i o n t o f i n d p o s i t i o n i n t h e p e r i o d i c t a b l e & ^{11} N a = [N e] 3 s^{1},_{12} M g = [N e] 3 s^{2} S t e p I I & A r r a n g e t h e m i n t h e o r d e r a s t h e y a r e i n t h e p e r i o d i c t a b l e & 11 N a 12 M g 13 A l 14 S i S t e p I I I & F o l l o w t h e g e n e r a l t r e n d a n d a l s o k e e p i n m i n d t h e e x c e p t i o n & T h e I P i n c r e a s e s a l o n g p e r i o d f r o m l e f t t o r i g h t b u t I P o f M g i s h i g h e r t h a n t h a t o f A l d u e t o c o m p l e t e l y f i l l e d 3 s o r b i t i a l i n M g . S t e p I V & O n t h e a b o v e b a s i s f i n d t h e o r d e r & T h e o r d e r o f I P i s N a < M g > A l < S i . t h u s o p t i o n (a) i s t h e c o r r e c t a n s w e r \end{matrix}$

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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

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

N a^{+}

M g^{2 +}

A l^{3 +}

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S i^{4 +}

are isoelectronic, their ionic size will follow the order:

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. The elements to which these energies correspond respectively are:

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S i

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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

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