Question

2 multiple choice 1 point which element shown below requires more force of attraction between the protons in the nucleus and its valence electrons? radon krypton

Explanation:

Step1: Understand effective nuclear charge

Effective nuclear charge affects attraction.

Step2: Analyze electron - shell shielding

Krypton (Kr) has fewer electron shells. Radon (Rn) has more electron shells, and the inner - shell electrons shield the valence electrons from the full nuclear charge. So, the effective nuclear charge experienced by valence electrons in Kr is relatively higher, meaning more force of attraction between the protons in the nucleus and its valence electrons compared to Rn.

Answer:

B. Krypton