Question

which energy level experiences the strongest effective nuclear charge?
energy level 4
energy level 2
energy level 3
energy level 1

Explanation:

Effective nuclear charge is the net positive charge experienced by an electron in an atom. Electrons in energy levels closer to the nucleus experience less shielding from inner electrons, so they feel a stronger pull from the nucleus's positive charge. Energy Level 1 is the closest to the nucleus, with no inner electron shells to shield its electrons from the nucleus's 20 positive protons.

Answer:

Energy Level 1