Multiple choice

Which of the following elements has the highest first ionisation potential?

  1. Sr

  2. Na

  3. Ca

  4. Mg

  5. Cr

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The atomic size of elements is Na < Mg < Ca < Cr < Sr. Ionisation potential ∝ 1/(Atomic Size) Na is the smallest atomic size. So, it has highest first ionisation potential.