A N/Z ratio close to 1 is most stable

• A. at high values of Z.
• B. at low values of Z.
• C. at all values of Z.
• D. When Z is greater than 83.
• E. Never; N/Z = 1 is never stable.

Answer: (B)

Verified step by step guidance

1. Understand the concept of N/Z ratio: The N/Z ratio refers to the ratio of neutrons (N) to protons (Z) in a nucleus. A stable nucleus typically has a balanced N/Z ratio.
2. Recognize the stability trend: For lighter elements (low Z), a N/Z ratio close to 1 is generally stable. As Z increases, the number of neutrons needed for stability increases, leading to a higher N/Z ratio.
3. Consider the implications of high Z values: For elements with Z greater than 83, the N/Z ratio needs to be greater than 1 to maintain stability due to the increased repulsion between protons.
4. Evaluate the options: Analyze each given option in the context of nuclear stability and the N/Z ratio. Consider how the stability changes with increasing Z.
5. Conclude based on nuclear stability principles: Determine which option correctly describes the stability of a N/Z ratio close to 1, considering the typical behavior of nuclei at different Z values.