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Arrange the following elements in order of increasing ionization energy: Sr, Be, Mg.

A. Be, Mg, Sr
B. Mg, Be, Sr
C. Be, Sr, Mg
D. Sr, Mg, Be

Answer :

Final answer:

The elements Sr, Mg, Be, all Alkaline Earth Metals, are arranged in order of increasing ionization energy as: Sr, Mg, Be.

Explanation:

The key to this question is understanding what ionization energy is and knowing that it generally increases across a period (left to right) on the periodic table and decreases down a group. Ionization energy is the energy it takes to remove an electron from an atom. Atoms with lower ionization energies lose their electrons more easily, making them more reactive.Here, all three elements are part of the same group (Group 2, the Alkaline Earth Metals). Strontium (Sr), being the furthest down the group, will have the lowest ionization energy. Moving up the group, we encounter Magnesium (Mg) next, and finally, Beryllium (Be) is at the top of this particular subset of elements, having the highest ionization energy. Therefore, the correct order of increasing ionization energy is Sr, Mg, Be. Your answer is D) Sr, Mg, Be.

Learn more about Ionization Energy here:

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