The n/p ratio is greater than 1 for stable isotopes, when the atomic number is larger than ________.

Question

Quizplus · Accepted Answer

The n/p ratio is defined as the ratio of the number of neutrons (n) to the number of protons (p) in the nucleus of an atom. For stable isotopes, this ratio is generally greater than 1 for atoms with large atomic numbers, as the added neutrons help to stabilize the nucleus against decay. Among the given choices, only option C (atomic number 20) satisfies this condition. Therefore, the correct answer is:

Answer: C
 The n/p ratio is greater than 1 for stable isotopes when the atomic number is larger than 20.

The N/p Ratio Is Greater Than 1 for Stable Isotopes