Question:
For atoms, which of the following statement is correct? (A) Heavier nuclei have more neutrons
For atoms, which of the following statement is correct? (A) Heavier nuclei have more neutrons
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More protons ⇒ more repulsion ⇒ need more neutrons.
Updated On: May 1, 2026
- Equal neutrons
- Lighter nuclei more neutrons
- Lighter fewer neutrons
- Mass ∝ Z²
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The Correct Option is A
Solution and Explanation
Concept: Stability of nuclei
The stability of a nucleus depends on the balance between: - Strong nuclear force (attractive) - Electrostatic repulsion between protons
Step 1: Light nuclei
For small atomic numbers: \[ N \approx Z \] since nuclear force is sufficient to hold nucleons together.
Step 2: Heavy nuclei
As $Z$ increases: - Proton–proton repulsion increases significantly - More neutrons are required to provide additional nuclear binding without adding repulsion
Step 3: Stability condition
Thus, for heavy nuclei: \[ N > Z \] Final Answer:
\[ \boxed{N > Z \text{ for heavy nuclei}} \]
The stability of a nucleus depends on the balance between: - Strong nuclear force (attractive) - Electrostatic repulsion between protons
Step 1: Light nuclei
For small atomic numbers: \[ N \approx Z \] since nuclear force is sufficient to hold nucleons together.
Step 2: Heavy nuclei
As $Z$ increases: - Proton–proton repulsion increases significantly - More neutrons are required to provide additional nuclear binding without adding repulsion
Step 3: Stability condition
Thus, for heavy nuclei: \[ N > Z \] Final Answer:
\[ \boxed{N > Z \text{ for heavy nuclei}} \]
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