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Classification of Elements and Periodicity in Properties
Isoelectronic Species
2 questions from 2 papers, each with its answer.
- questions
- 2
- papers
- 2
- years asked, 2017–2026
- 1 of 10
- of Classification of Elements and Periodicity in Properties
- 4.88%
Appears in
Concepts tested
- identifying isoelectronic pairs
- Isoelectronic ions
All Questions
2021 1 question
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From the following pairs of ions which one is not an iso-electronic pair?$Fe^{2+}$: $_{26}Fe = 3d^64s^2$, $Fe^{2+} = 3d^6$ → 24 electrons $Mn^{2+}$: $_{25}Mn = 3d^54s^2$, $Mn^{2+} = 3d^5$ → 23 electrons So $Fe^{2+}$ and $Mn^{2+}$ are not isoelectronic. ($Na^+$/$Mg^{2+}$ and $O^{2-}$/$F^-$ have 10 electrons each, and $Mn^{2+}$/$Fe^{3+}$ have 23 each.)
2014 AIPMT 1 question
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$Be^{2+}$ is isoelectronic with which of the following ions?$Be^{2+}$ and $Li^+$ both have 2 electrons.