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Q55
(NDA-II/2014)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Atomic and nuclear physics
Answer Verified
Which one among the following contains the most neutrons?
Result
Your answer:
—
·
Correct:
A
Explanation
The correct answer is Option 1 (2659Fe).
To determine the number of neutrons in an atom, we use the formula: Number of Neutrons (N) = Mass Number (A) - Atomic Number (Z). Calculating for the given options:
- Option 1 (2659Fe): Neutrons = 59 - 26 = 33
- Option 2 (2961Cu): Neutrons = 61 - 29 = 32
- Option 3 (3061Zn): Neutrons = 61 - 30 = 31
Comparing the results, Iron-59 contains 33 neutrons, which is the highest among the given isotopes. While Copper and Zinc have higher mass numbers in these specific instances, their higher atomic numbers (number of protons) result in a lower neutron count compared to this specific isotope of Iron. Therefore, Option 1 is the mathematically correct choice based on nuclear composition rules.
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