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Trend in Electronegativity

In which of t...

Question

In which of the following process highest energy is required?

C u \to C u^{+}

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A l \to A l^{+}

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Z n \to Z n^{+}

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L i \to L i^{+}

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Solution

The correct option is D $L i \to L i^{+}$
Lithium (Li) with atomic number 3 has the configuration: $1 s^{2} 2 s^{1}$ .
Therefore, Li has the smallest size and the outermost electron is in 2s subshell, so shielding experienced by valence electron is also less.

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E_{A l^{3} + / A l}^{0} + - 1.66 V, E_{C u^{2} + / C u}^{0} = + 0.34 V

E_{F e^{2} + / F e}^{0} = - 0.44 V, E_{M g^{2} + / M g}^{0} = - 1.40 V

E_{Z n^{2} + / Z n}^{0} = - 0.76 V

E^{0}

Z n / Z n + 2, E^{0} = - 0.76 V

C u^{+ 2} / C u, E^{0} = + 0.34 V

A l / A l^{+ 3}, E^{0} = - 1.66 V

H g^{2 +} / H g, E^{0} = + 0.885 V

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