Which one of the following has the lowest ionisation energy?

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

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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^{5}

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

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Solution

The correct option is C $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
In the Periodic Table, the minimum ionisation energy is found at alkali metals.
Hence sodium (electronic configuration $= 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ ) has the lowest ionisation energy.

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Similar questions

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

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

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

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

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}

A, B, C

D

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

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

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

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

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