10. Periodic Properties of the Elements

Which element experiences a greater shielding effect: bromine (Br) or chlorine (Cl)?

Which of the following best describes the effective nuclear charge (Z_eff) experienced by a valence electron in a bromine (Br) atom?

What is the effective nuclear charge (Z_eff) experienced by a 3s electron in a sodium atom (Na)?

Which of the following best represents the effective nuclear charge (Z_ext{eff}) experienced by the valence electrons in a phosphorus (P) atom?