- 1(current)
Q. No.Isotope of an element contains \(19.23 \%\) more neutrons as compared to protons. The correct element along with its mass number is: (Given Atomic number \(\mathrm{Fe: 26, Co: 27}\) )
| 1. | \(\mathrm {^{56}Fe }\) | 2. | \({ }^{57} \mathrm{Fe}\) |
| 3. | \({ }^{57} \mathrm{Co}\) | 4. | \({ }^{60} \mathrm{Co}\) |
Subtopic: Â Number of Electron, Proton & Neutron |
 58%
From NCERT
NEET - 2024
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NEET 2026 - Target Batch - Vital
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The number of protons, neutrons and electrons in \( _{71}^{175}Lu\) respectively, are:
1. 104, 71 and 71
2. 71, 71 and 104
3. 175, 104 and 71
4. 71, 104 and 71
Subtopic: Â Introduction of Atomic Structure |Â Number of Electron, Proton & Neutron |
 82%
From NCERT
NEET - 2020
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NEET 2026 - Target Batch - Vital
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An element X has the following isotopic composition:
200X: 90%
199X: 8.0%
202X: 2.0%
The weighted average atomic mass of the naturally-occurring element X is closest to:
1. 200 amu
2. 201 amu
3. 202 amu
4. 199 amu
Subtopic: Â Number of Electron, Proton & Neutron |
 69%
From NCERT
AIPMT - 2007
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NEET 2026 - Target Batch - Vital
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The nuclei of which one of the following pairs are isotones:
| 1. | \(34 \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}\) | 2. | \({ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Sr}^{86}\) |
| 3. | \({ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}\) | 4. | \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\) |
Subtopic: Â Number of Electron, Proton & Neutron |
 84%
From NCERT
AIPMT - 2005
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
- 1(current)
Q. No.
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