which atom will have the lowest ionization en...
which atom will have the lowest ionization energy?
Answer
# Explanation:
## Step1: Recall the trend of ionization energy
Ionization energy generally decreases down a group in the periodic table.
## Step2: Compare the positions of the elements
Among \(Ba\), \(Cs\), \(Sr\), and \(Rb\), \(Cs\) is located further down in the periodic table.
# Answer:
Cs