Question R4 Q16 - NSB Round Robin 2018

Which of the following statements is the best explanation for why the atomic radius decreases across a period to the right?

W) Increase in ionization energy at the valence shell

X) Increase in effective nuclear charge at the valence shell

Y) Increase in atomic polarizability at the valence shell

Z) Increase in electron affinity at the valence shell

Science Bowl Question