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Ionization Enthalpy

Which of the ...

Question

Which of the following has the highest second ionization energy?

C l

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S

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N a

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M g

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Solution

The correct option is B $N a$
Sodium has 11 electrons which can be written as (2, 8, 1). It's outer orbit has 1 electron. When it is ionized for the first time, the outer most electron is removed very easily, so that it can form the electronic configuration of the nearest inert gas, neon (2, 8).
Neon has 8 electrons in its outermost orbit. Thus it is highly stable. Now, when the second electron is removed, a very high amount of energy is required because it doesn't want to give away one of its outermost electron easily as it disrupts its stability. Thus, second ionization energy of sodium is extremely high.

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Similar questions

I_{M g} = First ionization energy of Mg

I I_{M g} = Second ionization energy of Mg

I_{N a} = First ionization energy of Na

I I_{N a} = Second ionization energy of Mg

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