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Using only the periodic table arrange the following elements in order of increasing ionization energy: radon,...

Using only the periodic table arrange the following elements in order of increasing ionization energy: radon, barium, thallium, cesium

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Answer #1

Radon : [Xe]6s2 4f145d106p6

Barium : [Xe] 6s2

Thallium : [Xe]6s2 4f145d106p1

Cesium : [Xe] 6s1

Ionization energy is the minimum amount of energy reqiured to remove electron from outermost shell of an atom.
These four elements belongs to the same period. So, on going from left to right in a period there is a decrease in the size of atom because of which ionization energy increases along the period.
Radon is inert gas and stable so it require high energy to remove electron.
on going from Cesium to Barium to thallium there is a decrease in the size of atom. So, IE increases.

Cs < Ba < Tl < Rn increasing order of IE.

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