Arrange the following atoms in order of increasing first ionization energies.

Question

Quizplus · Accepted Answer

First ionization energy generally increases across a period (from left to right) in the periodic table due to increasing nuclear charge, and decreases down a group due to increasing atomic size and electron shielding. Since Be is in the second period and Sr is in the fifth period, the correct order from lowest to highest first ionization energy, considering their positions in the periodic table, is Sr < Ca < Mg < Be.

Arrange the Following Atoms in Order of Increasing First Ionization