Which of the following has the highest first ionization energy?

Which of the following has the highest first ionization energy?

Step 1: Understand what first ionization energy means. It is the energy required to remove the outermost electron from an atom.
Step 2: Look at the elements given in the question. Identify their positions in the periodic table.
Step 3: Recall that ionization energy generally increases as you move from left to right across a period and decreases as you move down a group in the periodic table.
Step 4: Compare the elements based on their positions. Elements further to the right in the same period usually have higher ionization energies.
Step 5: Identify magnesium's position. It is in group 2 and period 3 of the periodic table.
Step 6: Compare magnesium with other elements in the same period or nearby groups to determine if it has the highest first ionization energy.
Step 7: Conclude that magnesium has the highest first ionization energy among the given elements.

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