NEET UG · Chemistry · Structure of Atom
Isoelectronic Species Configurations
NEET asked Isoelectronic Species Configurations once in 2017–2026, in 2021. It belongs to Quantum Numbers, in Structure of Atom (Chemistry).
Updated 2026-10-08
- Times asked
- 1
- in 2017–2026
- Papers
- 1
- of 10
- First asked
- 2021
- the only time
- Chance next paper
- 4%
- calibrated historical rate
Questions on this idea, by paper
2017–2026. 2021.
How NEET framed it
One-line MCQ is the usual form. Skill tested: application.
- Identify non isoelectronic pair of ions
Chance asked next paper 4%
Every question
The question
From the official NEET UG papers, newest first. Open one for the full question, the options and the official answer.
- 2021 Q95From the following pairs of ions which one is not an iso-electronic pair ?One-line MCQ · Easy
Papers: NEET 2021.
Same topic
Other ideas in Quantum Numbers
Quantum Numbers has 13 ideas NEET has asked; 2 of them came up in more than one question.
- Single-Electron Species Energy Exception3× · 2025
- Orbital Degeneracy2× · 2022
- Graphical Identification of Radial Nodesonce · 2026
- Azimuthal Quantum Number (l)once · 2024
- Fundamental Particles and Early Atomic Modelsonce · 2023
- Magnetic Quantum Number (ml)once · 2023
- Bohr Orbit Radiusonce · 2022
- Wave Nature of Electromagnetic Radiationonce · 2021
- Atomic Number, Mass Number and Particle Countsonce · 2020
- Hydrogen Spectral Seriesonce · 2019
- The (n+l) Ruleonce · 2019
- Electronic Filling Rulesonce · 2018