From the highest to lowest Ionization Energies for beryllium, calcium, magnesium, and strontium, the order is: Be > Mg > Ca > Sr
Ionization energy is defined as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to give off an electron.
Now, ionization energy usually decreases as it descends in a group. Thus, from the highest to lowest for beryllium, calcium, magnesium, and strontium, the order is determined as:
Be > Mg > Ca > Sr
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