The relative energies of 4s, 4p and 3d orbitals are in the order:
Correct answer: B. 4s < 3d < 4p
- A. 3d < 4p <4s
- B. 4s < 3d < 4p
- C. 4p < 4s < 3d
- D. 4p < 3d < 4s
Explanation
The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones (Aufbau is German for "building-up"). By following this rule, we can predict the electron configurations for atoms or ions. To find the energy of orbitals, we use the (n+l) principle where n= energy level, while l= orbital level.For 4s: n+l= 4 + 0 = 4For 3d: n+l= 3 + 2= 5For 4p: n+l = 4+ 1= 5 (but since the distance of 4p is greater than that of 3d, 3d gets filled first)Final order: 4s<3d<4p
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Atomic Structure
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Atomic Structure questions
Electronic configuration of Gold [Au79] is
Keeping in view the size of atoms, which order is correct?
Which one of the following will have the smallest radius?
The nature of cathode rays in discharge tube:
According to the number of protons, neutrons and electrons given in the table, which one of the following options is correct?
If the e/m value of electron is 1.7588 x 10^11 C/kg, then what would be the mass of electron in grams (charge on electron is 1.6022 x 10^-19 coulombs)?