MDCAT Chemistry MCQ #945

MDCAT Chemistry MCQ #945

1. Question 1

   Q1. The ionization energy of an element decreases down a group because...

   • A) Atoms have more protons shielding the outer electrons
   • B) Electron-electron repulsion increases significantly
   • C) Outer electrons are farther from the nucleus and less tightly held
   • D) The nuclear charge increases with atomic size

   Answer: Outer electrons are farther from the nucleus and less tightly held

   Explanation: Increased atomic radius reduces nuclear attraction. Shielding increases, but the primary reason is distance.