Aufbau Principle
According to the Aufbau principle, which orbital is filled before 4p?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More atomic structure Practice Questions
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. ...
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%...
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, ...
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 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...
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...
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...
Which of the following statements correctly describes the shape and orientation of the p_z orbital r...
Which of the following statements correctly describes the shape and orientation of the p_z orbital r...
What is the minimum energy required in electron volts to completely remove an electron from the n=2 ...
What is the minimum energy required in electron volts to completely remove an electron from the n=2 ...
Electromagnetic radiation of wavelength 300 nm has a certain energy per photon. How many photons of ...
Electromagnetic radiation of wavelength 300 nm has a certain energy per photon. How many photons of ...
According to Hund's rule of maximum multiplicity, which electronic configuration represents the corr...
According to Hund's rule of maximum multiplicity, which electronic configuration represents the corr...
In a multi-electron atom, the effective nuclear charge Z_eff experienced by an electron in the 3p su...
In a multi-electron atom, the effective nuclear charge Z_eff experienced by an electron in the 3p su...
About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- aufbau principle
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
3d
The Aufbau Principle dictates that orbitals are filled in increasing order of energy, following the (n+l) rule:
- 3d: n=3,l=2⟹n+l=5
- 4p: n=4,l=1⟹n+l=5
- When (n+l) values are equal, the orbital with the lower value of n has lower energy and is filled first.
- Therefore, 3d (n=3) is filled before 4p (n=4). Filling order: …4s→3d→4p…
This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of aufbau principle. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse atomic structure questions on RankGuru.