MDCAT Chemistry MCQ #820

MDCAT Chemistry MCQ #820

1. Question 1

   Q1. Why does the second ionization energy of calcium exceed that of potassium?

   • A) Calcium's 2+ charge stabilizes its ion
   • B) Potassium's first IE is lower
   • C) Electron removal from a noble gas core in Ca⁺
   • D) Greater electron affinity in potassium

   Answer: Electron removal from a noble gas core in Ca⁺

   Explanation: Removing an electron from Ca⁺ (Ar core) requires more energy than from K⁺ (Ar core). A and B are irrelevant.