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Which has a higher ionization energy: chlorine (Cl) or magnesium (Mg)? Why? Select the best answer.

Cl; it takes much more energy to pull an electron away from a valence shell that is nearly full.

Mg; it takes more energy to pull two electrons away from magnesium (Mg) than it does to take them from chlorine (Cl).

Mg; magnesium has more valence electrons than chlorine.

Cl; it takes less energy to add an electron to a valence shell that is nearly full.

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  1. For the first ionization potential chlorine is higher than Mg. Of the choices listed A is the best BUT I don't like the reasoning of A at all.

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