Elements with their electronic configurations are given below :
Answer the following questions :
$I : 1 s^{2} 2 S^{2}$
$I I : 1 s^{2} 2 s^{2} 2 p^{6}$
$I I : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$
$I V : 1 s^{2} 2 s^{2} 2 p^{3}$
$V : 1 s^{2} 2 s^{2} 2 p^{5}$
The element with highest $I . E .$ is :

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III

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Solution

The correct option is C I
I and II belongs to the $18^{t h}$ group (noble gas elements). Noble gas elements have highest Ionisation energy across the group. $1 s^{2} 2 s^{2}$ is Helium and $1 s^{2} 2 s^{2} 2 p^{6}$ is Neon. Since Neon resides just below the Helium and we know that ionisation energy decrease moving down the group. Hence $(I)$ will have highest $I . E .$

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Similar questions

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

1 s^{2} 2 s^{2} 2 p^{3}

1 s^{2} 2 s^{2} 2 p^{5}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

1 s^{2} 2 s^{2} 2 p^{6}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

P \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3} Q \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1} R \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{3} S \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{1}

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