Question

3 multiple choice 1 point which element shown below requires more energy to remove an electron? radon krypton

Explanation:

Step1: Recall ionization - energy trend

Ionization energy generally decreases down a group.

Step2: Locate elements in periodic table

Kr (Krypton) and Rn (Radon) are in the noble - gas group. Rn is below Kr in the periodic table.

Step3: Determine the answer

Since ionization energy decreases down a group, Kr has a higher first - ionization energy (it requires more energy to remove an electron) compared to Rn. So the element that requires more energy to remove an electron is Radon.

Answer:

A. Radon