Which of the following statements is true?
A) Outer electrons efficiently shield one another from nuclear charge.
B) Core electrons effectively shield outer electrons from nuclear charge.
C) Valence electrons are the most difficult of all electrons to remove.
D) Core electrons have the lowest ionization energies of all electrons.
E) Valence electrons in the outermost shell of all elements have the highest ionization energy.

Question

Quizplus · Accepted Answer

Core electrons are closer to the nucleus and shield the outer electrons from the positive charge of the nucleus, reducing the effective nuclear charge felt by the valence electrons. This makes it easier to remove valence electrons and results in higher ionization energies for core electrons.

Which of the Following Statements Is True