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Q.

Which of the following s-block metals has the lowest first ionization energy?

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a

Na

b

Be

c

Mg

d

Li

answer is C.

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Detailed Solution

Sodium metals has the lowest first ionization energy.

The distance between the outer electron and the nucleus is the factor on which the first ionization energy depends.

The distance between the outer electron and the nucleus in sodium atom is grater hence sodium metals has the lowest first ionization energy.

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