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Which of the following atoms has the highest first ionization energy ?

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

Correct answer: Sc

Solution

Scandium (Sc) has a higher first ionization energy compared to rubidium (Rb), sodium (Na), and potassium (K) because it is located further to the right in the periodic table, where elements generally have a stronger attraction between the nucleus and their outer electrons, making it more difficult to remove an electron.

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