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Which atom th...

Question

Which atom that has the largest second ionization energy?

M g

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C l

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S

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C a

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N a

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Solution

The correct option is C $N a$
Sodium, Na atoms have the largest second ionization energy.

When sodium loses one electron, it forms $N a^{+}$ ion which has the stable noble gas configuration of Ne.

When $N a^{+}$ ions lose an electron, this stable configuration of Ne is broken. This requires a high amount of energy.

Hence, the second ionization energy of sodium is the largest.

Hence, the correct option is $E$

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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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