Which of the following has $2^{n d} I P < 1^{s t} I P$ ?

M g

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N e

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C

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None

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Solution

The correct option is B None
Electronic configuration:
$M g - [N e] 3 s^{2}$
$M g^{+} - [N e] 3 s^{1}$
$C - [H e] 2 s^{2} 2 p^{2}$
$C^{+} - [H e] 2 s^{2} 2 p^{1}$
In all cases $I P_{1} < I P_{2}$ . Generally $I P_{1} < I P_{2}$ but in some cases where the case of stable configuration arises $I P_{1}$ can be higher than $I P_{2}$

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Similar questions

2^{n d} I P < 1^{s t} I P

[N e] 3 s^{2} 3 p^{3}

[N e] 3 s^{2} 3 p^{4}

[N e] 3 s^{2} 3 p^{5}

[N e] 3 s^{2} 3 p^{2}

Arrange the following in order of their increasing atomic number:

Si, Ne, Mg, S, C

[N e] 3 s^{2} 3 p^{3}

[N e] 3 s^{2} 3 p^{4}

[N e] 3 s^{2} 3 p^{5}

[N e] 3 s^{2} 3 p^{2}

Which element from the following has the highest ionisation energy ?

(a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar

Explain your choice.

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