Question

what term is used to describe the phenomena occurring when valence electrons experience a reduced electrostatic force from the nucleus due to the interference of core electrons?
shielding
distance effects
electron repulsion
effective nuclear charge

Explanation:

This term refers to the core electrons blocking part of the nucleus's electrostatic attraction, lessening the pull on valence electrons. Effective nuclear charge is the resulting net attraction, while electron repulsion and distance effects are related but not the specific term for this core electron interference phenomenon.

Answer:

A. Shielding