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