Question

Arrange the following elements in order of their increasing ionization energies $O,S,Se,Te,Po$.

• A. $Se,Te,S,Po,O$
• B. $O,S,Se,Te,Po$
• C. $Po,Te,Se,S,O$
• D. $Te,O,S,Po,Se$

Answer 1

Answer: (C)

$Po,Te,Se,S,O$

Ionization energy decreases from top to bottom in a group due to increase in the size of atom.Due to increase in size of atom its ionization energy decreases from top to bottom , So increasing order will be $Po<Te<Se<S<O$.

Hence, option $C$ is the correct answer.