Ionization may cause which outcome in atoms?

• A. Stable atoms
• B. Production of high-energy X-rays
• C. Formation of new molecules beneficial to the cell
• D. Unstable atoms

Answer: (D)

Ionization takes electrons away, changing the electron cloud and leaving the atom as a charged ion. This removal leaves the atom in a higher-energy, less-stable state than the neutral form, so the ion is energetically unstable and highly reactive. The system tends to regain stability by recombining with electrons or shedding energy, sometimes emitting radiation in the process. In short, ionization produces unstable atoms rather than stable ones, which is why that option is the best choice.