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Molecules

Which of the ...

Question

Which of the following elements will have highest second ionisation enthalpy?

1 s^{2}

2 s^{2}

2 p^{6}

3 s^{2}

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1 s^{2}

2 s^{2}

2 p^{6}

3 s^{1}

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1 s^{2}

2 s^{2}

2 p^{6}

3 s^{2}

3 p^{2}

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1 s^{2}

2 s^{2}

2 p^{6}

3 s^{2}

3 p^{3}

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Solution

The correct option is B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{1}$
Highest second ionization enthalpy is seen when removal of $1$ electron makes the atom highly stable.
Here in, $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ , after removal of $1$ electron it attains inert gas configuration. So, second ionization enthalpy is high.

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

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

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

{1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {4 s}^{1}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}

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\begin{matrix} List-I & List - II P. & 1 s^{2} & 1. & Element shows highest negative oxidation state Q. & 1 s^{2} 2 s^{2} 2 p^{5} & 2. & Element shows highest first ionisation enthalpy R. & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} & 3. & Element shows highest electronegativity on Pauling scale S. & 1 s^{2} 2 s^{2} 2 p^{2} & 4. & Element shows maximum electron gain enthalpy (most exothermic) \end{matrix}

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