Question

Arrange the following elements in order of their increasing ionisation 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)

$Po,Te,Se,S,O$

Ionisation energy decreases from top to bottom in a group. So increasing order will be
Po < Te < Se < S < O