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Consider the following electron configurations for neutral atoms: Atom I = 1s2 2s2 2p6 3s2 Atom...

Consider the following electron configurations for neutral atoms: Atom I = 1s2 2s2 2p6 3s2 Atom II = 1s2 2s2 2p6 3s2 3p4 Atom III = 1s2 2s2 2p6 3s2 3p6 Which atom would be expected to have the largest third ionization energy?

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Answer #1

Ionization energy is the energy required to remove the electron from an neutral atom to rise a positive charge on it.

And the Ionization energy increases across a period and decreases along a group

Here Ar has highest ionization energy because it is a noble gas. It has complete filled orbitals.

The increasing order of the ionization energy :

Mg < S < Ar

The element with largest third ionization energy is Mg

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