Electronic Configuration
The number of unpaired electrons in Fe²⁺ (Z = 26) is:
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More atomic structure Practice Questions
The ground state electronic configuration of Cu (Z=29) deviates from the expected Aufbau order. Whic...
The ground state electronic configuration of Cu (Z=29) deviates from the expected Aufbau order. Whic...
Among the following species, which one has the electronic configuration [Ar] 3d5?
Among the following species, which one has the electronic configuration [Ar] 3d5?
Which of the following electronic configurations violates Hund's rule of maximum multiplicity?
Which of the following electronic configurations violates Hund's rule of maximum multiplicity?
The electronic configuration of chromium (Z = 24) is:
The electronic configuration of chromium (Z = 24) is:
Bohr's atomic model successfully explains the hydrogen spectrum but fails for multi-electron atoms. ...
Bohr's atomic model successfully explains the hydrogen spectrum but fails for multi-electron atoms. ...
In a many-electron atom, the energy of the 4s orbital is lower than that of 3d in the ground state, ...
In a many-electron atom, the energy of the 4s orbital is lower than that of 3d in the ground state, ...
An element X has two naturally occurring isotopes: X-35 with 75% natural abundance and X-37 with 25%...
An element X has two naturally occurring isotopes: X-35 with 75% natural abundance and X-37 with 25%...
A proton and an alpha particle are both accelerated through the same potential difference V. What is...
A proton and an alpha particle are both accelerated through the same potential difference V. What is...
The radial probability distribution function 4πr^2 ψ^2 for a 2s orbital in hydrogen shows two maxima...
The radial probability distribution function 4πr^2 ψ^2 for a 2s orbital in hydrogen shows two maxima...
The energy of the electron in the ground state of the hydrogen atom is -2.18 × 10^-18 J. What is the...
The energy of the electron in the ground state of the hydrogen atom is -2.18 × 10^-18 J. What is the...
The radius of the first Bohr orbit for hydrogen is 0.529 Å. What would be the radius of the second o...
The radius of the first Bohr orbit for hydrogen is 0.529 Å. What would be the radius of the second o...
Which spectral series of hydrogen involves electron transitions to the n=3 level, and in which regio...
Which spectral series of hydrogen involves electron transitions to the n=3 level, and in which regio...
About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- electronic configuration
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
4
- Neutral Atom Fe (Z=26): [Ar]3d64s2
- Ion Fe2+: Electrons are always removed first from the outermost shell (n=4).
- Fe2+=[Ar]3d6
- Distribution in 3d subshell: Applying Hund's Rule (occupy degenerate orbitals singly first):
- dxy2dyz1dzx1dx2−y21dz21
- Orbitals with single electrons: 4
- Thus, number of unpaired electrons is 4.
This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of electronic configuration. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse atomic structure questions on RankGuru.