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Among the following atoms, which one has the greatest first ionization energy?

1. K
2. Sc
3. Rb
4. Na

Correct answer: Sc

Solution

Scandium (Sc) has a higher first ionization energy than potassium (K), rubidium (Rb), and sodium (Na) because it is located further to the right in the periodic table, where atoms have a stronger effective nuclear charge and hold onto their electrons more tightly.

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