Question

all of the following trends increase as shielding increases except- atomic radii ionic radii metallic properties ionization energy

Explanation:

Step1: Understand shielding effect

Shielding effect is due to inner - shell electrons reducing the effective nuclear charge on outer - shell electrons.

Step2: Analyze atomic radii

As shielding increases, outer electrons are less attracted to the nucleus, so atomic radii increase.

Step3: Analyze ionic radii

Similar to atomic radii, more shielding makes it easier for ions to expand, so ionic radii increase.

Step4: Analyze metallic properties

With more shielding, outer electrons are more easily lost, enhancing metallic properties like conductivity and malleability.

Step5: Analyze ionization energy

Ionization energy is the energy required to remove an electron. As shielding increases, outer electrons are less tightly held, so it takes less energy to remove them, and ionization energy decreases.

Answer:

D. ionization energy