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Rank the following elements in order of increasing first ionization energy (IE1): Ba, Sr, Cl, I.

A. Ba < Sr < Cl < I
B. I < Cl < Sr < Ba
C. Cl < I < Sr < Ba
D. Ba < Cl < Sr < I

Answer :

Final answer:

The order of the elements in terms of increasing first ionization energy (IE1) from lowest to highest is: Barium (Ba), Strontium (Sr), Iodine (I), and Chlorine (Cl). This order is determined by the position of the elements on the periodic table.

Explanation:

The ionization energy of elements tends to increase from left to right across a period and decrease down a group on the periodic table. This pattern is due to the effective nuclear charge and the distance of the valence electrons from the nucleus. Barium (Ba) and Strontium (Sr) are in the same group (Group 2) with Ba being below Sr, while Chlorine (Cl) and Iodine (I) are in the same group (Group 17) with I being below Cl.

Applying these patterns, the correct order of the elements in terms of increasing first ionization energy (IE1) would be: Ba < Sr < I < Cl

This order indicates that Barium has the lowest ionization energy and Chlorine has the highest, with Strontium and Iodine falling in between.

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