Which of the following elements has the smallest ionization energy?

Which of the following elements has the smallest ionization energy?

Step 1: Understand what ionization energy is. It is the energy required to remove an electron from an atom.
Step 2: Know that ionization energy decreases as you move down a group in the periodic table. This means that elements lower in a group have lower ionization energy.
Step 3: Identify the elements you are comparing. In this case, we are looking for the element with the smallest ionization energy.
Step 4: Find the position of rubidium in the periodic table. It is located in Group 1 and is lower than other elements in that group.
Step 5: Conclude that since rubidium is lower in the group, it has the smallest ionization energy compared to the other elements listed.

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