Arrange Mg, Al, Si, P and S in the correct order of their ionisation potentials.

P < S < Si < Mg < Al

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P > S > Si > Mg > Al

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P > S > Al > Mg > Si

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S > P > Al > Mg > Si

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Solution

The correct option is B P > S > Si > Mg > Al
Answer: P > S > Si > Mg > Al

In the third period of the periodic table,

Element

Valence Shell Configuration

Na

3s¹

Mg

3s²

Al

3s²3p¹

Si

3s²3p²

P

3s²3p³

S

3s²3p⁴

Ideally, from left to right, ionization enthalpy increases. But we see exceptions in (Mg, Al) & (P, S) where the element to the left, Mg and P, have higher ionization enthalpies compared to their respective immediate neighbors due to stable electronic configuration.

So, the order will be: P > S > Si > Mg > Al

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Question 17
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

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Element	Valence Shell Configuration
Na	3s¹
Mg	3s²
Al	3s²3p¹
Si	3s²3p²
P	3s²3p³
S	3s²3p⁴