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Consider four elements from Group 7A: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy?

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scme1702
Fluorine

This is because the atom of the fluorine is the smallest, meaning its electrons have the least amount of shielding effect and are held together tightly. As we progress down the group, another shell of electrons is added each time, increasing the shielding effect and making electron removal easier.

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