Question

Nuclides with the same number of neutrons are called:

• A. Isobars
• B. Isotones
• C. Isotopes
• D. Isomers

Hint:

Memory trick:

Iso\textbf{topes} → same pro\textbf{tons}
Iso\textbf{tones} → same neu\textbf{trons}
Iso\textbf{bars} → same mass num\textbf{ber}

Answer 1

The Correct Option is B

Concept: Atomic nuclei are classified based on similarities in proton number, neutron number, or mass number. Key definitions:

Isotopes: Same atomic number (same protons), different neutrons
Isobars: Same mass number, different atomic numbers
Isotones: Same number of neutrons, different protons
Isomers: Same nucleus in different energy states

Step 1: Identify the required condition. The question asks for nuclides having the same number of neutrons.
Step 2: Match with definitions. From standard nuclear terminology:

Same neutrons → Isotones

Step 3: Eliminate other options.

Isobars → Same mass number, not neutrons
Isotopes → Same protons
Isomers → Same nucleus, different energy states

Step 4: Conclusion. Nuclides with equal numbers of neutrons are called isotones.